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MPL 40x20x4x2[7/3.5] / N38 - lamellar magnet

lamellar magnet

Catalog no 020159

GTIN/EAN: 5906301811657

5.00

length

40 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

24 g

Magnetization Direction

↑ axial

Load capacity

7.52 kg / 73.80 N

Magnetic Induction

168.28 mT / 1683 Gs

Coating

[NiCuNi] Nickel

see parameters »

17.96 ZŁ with VAT / pcs + price for transport

14.60 ZŁ net + 23% VAT / pcs

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Detailed specification - MPL 40x20x4x2[7/3.5] / N38 - lamellar magnet

Specification / characteristics - MPL 40x20x4x2[7/3.5] / N38 - lamellar magnet

properties
properties values
Cat. no. 020159
GTIN/EAN 5906301811657
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin Poland / China / Germany
Customs code 85059029
length 40 mm [±0,1 mm]
Width 20 mm [±0,1 mm]
Height 4 mm [±0,1 mm]
Weight 24 g
Magnetization Direction ↑ axial
Load capacity ~ ? 7.52 kg / 73.80 N
Magnetic Induction ~ ? 168.28 mT / 1683 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x20x4x2[7/3.5] / N38 - lamellar magnet
properties values units
remenance Br [min. - max.] ? 12.2-12.6 kGs
remenance Br [min. - max.] ? 1220-1260 mT
coercivity bHc ? 10.8-11.5 kOe
coercivity bHc ? 860-915 kA/m
actual internal force iHc ≥ 12 kOe
actual internal force iHc ≥ 955 kA/m
energy density [min. - max.] ? 36-38 BH max MGOe
energy density [min. - max.] ? 287-303 BH max KJ/m
max. temperature ? ≤ 80 °C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
properties values units
Vickers hardness ≥550 Hv
Density ≥7.4 g/cm3
Curie Temperature TC 312 - 380 °C
Curie Temperature TF 593 - 716 °F
Specific resistance 150 μΩ⋅cm
Bending strength 250 MPa
Compressive strength 1000~1100 MPa
Thermal expansion parallel (∥) to orientation (M) (3-4) x 10-6 °C-1
Thermal expansion perpendicular (⊥) to orientation (M) -(1-3) x 10-6 °C-1
Young's modulus 1.7 x 104 kg/mm²

Engineering analysis of the magnet - data

Presented data are the result of a mathematical calculation. Results are based on models for the material Nd2Fe14B. Operational conditions may differ from theoretical values. Treat these data as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs distance) - power drop
MPL 40x20x4x2[7/3.5] / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1683 Gs
168.3 mT
 7.52 kg / 16.58 lbs
7520.0 g / 73.8 N
 warning
1 mm 1613 Gs
161.3 mT
 6.91 kg / 15.24 lbs
6913.8 g / 67.8 N
 warning
2 mm 1524 Gs
152.4 mT
 6.17 kg / 13.61 lbs
6172.9 g / 60.6 N
 warning
3 mm 1423 Gs
142.3 mT
 5.38 kg / 11.86 lbs
5379.4 g / 52.8 N
 warning
5 mm 1207 Gs
120.7 mT
 3.87 kg / 8.53 lbs
3869.8 g / 38.0 N
 warning
10 mm 744 Gs
74.4 mT
 1.47 kg / 3.24 lbs
1469.3 g / 14.4 N
 low risk
15 mm 455 Gs
45.5 mT
 0.55 kg / 1.21 lbs
550.7 g / 5.4 N
 low risk
20 mm 288 Gs
28.8 mT
 0.22 kg / 0.49 lbs
220.3 g / 2.2 N
 low risk
30 mm 129 Gs
12.9 mT
 0.04 kg / 0.10 lbs
44.4 g / 0.4 N
 low risk
50 mm 38 Gs
3.8 mT
 0.00 kg / 0.01 lbs
3.8 g / 0.0 N
 low risk
Magnetic force weakens drastically per each millimeter of distance. Note that even a microscopic distance (e.g., dirt, paint, dust) noticeably weakens the grip. Magnets hold optimally in perfect adhesion; gap weakens the power. See how quickly the pull force drop, when the magnet does not touch flatly to the metal substrate. When planning the assembly, discard redundant distances.

Table 2: Slippage capacity (wall)
MPL 40x20x4x2[7/3.5] / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.50 kg / 3.32 lbs
1504.0 g / 14.8 N
1 mm Stal (~0.2) 1.38 kg / 3.05 lbs
1382.0 g / 13.6 N
2 mm Stal (~0.2) 1.23 kg / 2.72 lbs
1234.0 g / 12.1 N
3 mm Stal (~0.2) 1.08 kg / 2.37 lbs
1076.0 g / 10.6 N
5 mm Stal (~0.2) 0.77 kg / 1.71 lbs
774.0 g / 7.6 N
10 mm Stal (~0.2) 0.29 kg / 0.65 lbs
294.0 g / 2.9 N
15 mm Stal (~0.2) 0.11 kg / 0.24 lbs
110.0 g / 1.1 N
20 mm Stal (~0.2) 0.04 kg / 0.10 lbs
44.0 g / 0.4 N
30 mm Stal (~0.2) 0.01 kg / 0.02 lbs
8.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
This section calculates the theoretical weight limit needed to initiate the sliding of the magnet down along a vertical steel wall (assuming standard friction). The holding force varies with the separation distance between the magnet and the metal.

Table 3: Wall mounting (shearing) - vertical pull
MPL 40x20x4x2[7/3.5] / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.26 kg / 4.97 lbs
2256.0 g / 22.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.50 kg / 3.32 lbs
1504.0 g / 14.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.75 kg / 1.66 lbs
752.0 g / 7.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.76 kg / 8.29 lbs
3760.0 g / 36.9 N
When mounting a element on a upright wall (e.g., a fridge), it will maintain only approx. 1/5 of nominal attraction strength. Gravitational force and a low friction coefficient cause that magnets slip easier than they pull off. Planning a vertical fastening? Note that the shear force is noticeably lower than the maximum static pull force. On a slippery surface, the holder will slide down under a much lighter load. Utilizing a rubberized layer can significantly increase the grip.

Table 4: Material efficiency (substrate influence) - power losses
MPL 40x20x4x2[7/3.5] / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.75 kg / 1.66 lbs
752.0 g / 7.4 N
1 mm
25%
 1.88 kg / 4.14 lbs
1880.0 g / 18.4 N
2 mm
50%
 3.76 kg / 8.29 lbs
3760.0 g / 36.9 N
3 mm
75%
 5.64 kg / 12.43 lbs
5640.0 g / 55.3 N
5 mm
100%
 7.52 kg / 16.58 lbs
7520.0 g / 73.8 N
10 mm
100%
 7.52 kg / 16.58 lbs
7520.0 g / 73.8 N
11 mm
100%
 7.52 kg / 16.58 lbs
7520.0 g / 73.8 N
12 mm
100%
 7.52 kg / 16.58 lbs
7520.0 g / 73.8 N
A thin metal plate is unable to absorb the entire magnetic field, which weakens actual performance of the holder. If you attach a powerful product to a too thin substrate, the magnetism will pass right through and the holding will be smaller. To utilize 100% of this neodymium's power, you need a suitably thick piece of steel. The saturation effect means that on sheet metal structures (e.g., thin profiles), the product works worse. We recommend selecting the steel dimension according to the table below.

Table 5: Thermal stability (material behavior) - power drop
MPL 40x20x4x2[7/3.5] / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 7.52 kg / 16.58 lbs
7520.0 g / 73.8 N
 OK
40 °C -2.2% 7.35 kg / 16.21 lbs
7354.6 g / 72.1 N
 OK
60 °C -4.4% 7.19 kg / 15.85 lbs
7189.1 g / 70.5 N
80 °C -6.6% 7.02 kg / 15.48 lbs
7023.7 g / 68.9 N
100 °C -28.8% 5.35 kg / 11.80 lbs
5354.2 g / 52.5 N
Classic neodymiums irreversibly lose parameters after exceeding the maximum temperature. Watch out for overheating – high temperature can permanently demagnetize this magnet. With increasing heat, the neodymium's power briefly decreases. Refrain from using this product in hot environments exceeding its operating temperature limit. Exceeding the critical threshold will lead to irreversible degradation of magnetic properties.
*Engineering note: Thermal stability depends not only on the material grade, as well as the dimension ratios. Flat magnets (pancake types) risk losing magnetic properties sooner compared to rod magnets. Red status in the table points to permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field range
MPL 40x20x4x2[7/3.5] / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 13.96 kg / 30.78 lbs
2 997 Gs
2.09 kg / 4.62 lbs
2094 g / 20.5 N
 N/A
1 mm 13.44 kg / 29.64 lbs
3 302 Gs
2.02 kg / 4.45 lbs
2017 g / 19.8 N
 12.10 kg / 26.68 lbs
~0 Gs
2 mm 12.84 kg / 28.30 lbs
3 227 Gs
1.93 kg / 4.25 lbs
1926 g / 18.9 N
 11.55 kg / 25.47 lbs
~0 Gs
3 mm 12.17 kg / 26.83 lbs
3 142 Gs
1.83 kg / 4.02 lbs
1826 g / 17.9 N
 10.95 kg / 24.15 lbs
~0 Gs
5 mm 10.73 kg / 23.65 lbs
2 950 Gs
1.61 kg / 3.55 lbs
1609 g / 15.8 N
 9.66 kg / 21.29 lbs
~0 Gs
10 mm 7.19 kg / 15.84 lbs
2 414 Gs
1.08 kg / 2.38 lbs
1078 g / 10.6 N
 6.47 kg / 14.26 lbs
~0 Gs
20 mm 2.73 kg / 6.01 lbs
1 487 Gs
0.41 kg / 0.90 lbs
409 g / 4.0 N
 2.46 kg / 5.41 lbs
~0 Gs
50 mm 0.18 kg / 0.39 lbs
379 Gs
0.03 kg / 0.06 lbs
27 g / 0.3 N
 0.16 kg / 0.35 lbs
~0 Gs
60 mm 0.08 kg / 0.18 lbs
259 Gs
0.01 kg / 0.03 lbs
12 g / 0.1 N
 0.07 kg / 0.16 lbs
~0 Gs
70 mm 0.04 kg / 0.09 lbs
183 Gs
0.01 kg / 0.01 lbs
6 g / 0.1 N
 0.04 kg / 0.08 lbs
~0 Gs
80 mm 0.02 kg / 0.05 lbs
133 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
 0.02 kg / 0.04 lbs
~0 Gs
90 mm 0.01 kg / 0.03 lbs
99 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
 0.01 kg / 0.02 lbs
~0 Gs
100 mm 0.01 kg / 0.02 lbs
76 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnetic products attract each other from a much further distance than a neodymium and metal setup. Such a system of two magnets produces a massive flux and a wider radius of action. Planning to create a solid fastener? Use a pair of magnets instead of one magnet and a striker plate. Remember that when attracting two neodymiums, the pinch force is huge. The repulsion force is a bit weaker than the connection force, but still significant.
*The magnetic induction between like poles reaches ~0 Gs at the geometric center of the gap (resulting from vector opposition).
* Calculations apply to friction force of two matching magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Protective zones (electronics) - precautionary measures
MPL 40x20x4x2[7/3.5] / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 10.5 cm
Hearing aid 10 Gs (1.0 mT) 8.5 cm
Timepiece 20 Gs (2.0 mT) 6.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 5.0 cm
Remote 50 Gs (5.0 mT) 4.5 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
A strong magnetic field poses a large risk to electronic devices and pacemakers. These NdFeB products produce a flux that disrupts operation of digital equipment. Remember: the invisible magnetic field acts through matter and glass. Exceptional care must be taken by people with hearing aids and insulin pumps. Also at risk are: automatic timepieces, car keys, membranes, and screens. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - warning
MPL 40x20x4x2[7/3.5] / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 19.91 km/h
(5.53 m/s)
 0.37 J
30 mm 31.03 km/h
(8.62 m/s)
 0.89 J
50 mm 39.93 km/h
(11.09 m/s)
 1.48 J
100 mm 56.45 km/h
(15.68 m/s)
 2.95 J
Magnetic elements are prone to chipping – a strong collision with metal risks their cracking. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Impact energy can destroy the magnet or injury to fingers. Be sure to control the product during bringing near metal so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Use safety goggles when handling with powerful specimens.

Table 9: Surface protection spec
MPL 40x20x4x2[7/3.5] / N38

Technical parameter Value / Description
Coating type [NiCuNi] Nickel
Layer structure Nickel - Copper - Nickel
Layer thickness 10-20 µm
Salt spray test (SST) ? 24 h
Recommended environment Indoors only (dry)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Pc)
MPL 40x20x4x2[7/3.5] / N38

Parameter Value SI Unit / Description
Magnetic Flux 15 299 Mx 153.0 µWb
Pc Coefficient 0.19 Low (Flat)
Flux value passing through the pole surface. Key data when building generators as well as sensors. The Pc coefficient defines the working geometry.

Table 11: Submerged application
MPL 40x20x4x2[7/3.5] / N38

Environment Effective steel pull Effect
Air (land) 7.52 kg Standard
Water (riverbed) 8.61 kg
(+1.09 kg buoyancy gain)
+14.5%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
The magnetic field penetrates through water without any losses. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Wall mount (shear)

*Caution: On a vertical wall, the magnet retains only ~20% of its perpendicular strength.

2. Efficiency vs thickness

*Thin steel (e.g. 0.5mm PC case) severely weakens the holding force.

3. Power loss vs temp

*For standard magnets, the safety limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.19

The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. The solid red line represents the demagnetization curve (material potential), while the dashed blue line is the load line based on the magnet's geometry. The Pc (Permeance Coefficient), also known as the load line slope, is a dimensionless value that describes the relationship between the magnet's shape and its magnetic stability. The intersection of these two lines (the black dot) is the operating point — it determines the actual magnetic flux density generated by the magnet in this specific configuration. A higher Pc value means the magnet is more 'slender' (tall relative to its area), resulting in a higher operating point and better resistance to irreversible demagnetization caused by external fields or temperature. A value of 0.42 is relatively low (typical for flat magnets), meaning the operating point is closer to the 'knee' of the curve — caution is advised when operating at temperatures near the maximum limit to avoid strength loss.

Engineering data and GPSR
Material specification
iron (Fe) 64% – 68%
neodymium (Nd) 29% – 32%
boron (B) 1.1% – 1.2%
dysprosium (Dy) 0.5% – 2.0%
coating (Ni-Cu-Ni) < 0.05%
Environmental data
recyclability (EoL) 100%
recycled raw materials ~10% (pre-cons)
carbon footprint low / zredukowany
waste code (EWC) 16 02 16
Safety card (GPSR)
responsible entity
Dhit sp. z o.o.
ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki
tel: +48 22 499 98 98 | e-mail: bok@dhit.pl
batch number/type
id: 020159-2026
Quick Unit Converter
Force (pull)
Magnetic Field
Enter a value in one of the inputs, and the remaining units will convert in real-time.

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This product is a very powerful magnet in the shape of a plate made of NdFeB material, which, with dimensions of 40x20x4 mm and a weight of 24 g, guarantees the highest quality connection. This magnetic block with a force of 73.80 N is ready for shipment in 24h, allowing for rapid realization of your project. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
The key to success is shifting the magnets along their largest connection plane (using e.g., the edge of a table), which is easier than trying to tear them apart directly. Watch your fingers! Magnets with a force of 7.52 kg can pinch very hard and cause hematomas. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
Plate magnets MPL 40x20x4x2[7/3.5] / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. They work great as fasteners under tiles, wood, or glass. Customers often choose this model for workshop organization on strips and for advanced DIY and modeling projects, where precision and power count.
For mounting flat magnets MPL 40x20x4x2[7/3.5] / N38, it is best to use two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. In practice, this means that this magnet has the greatest attraction force on its main planes (40x20 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 40x20x4 mm, which, at a weight of 24 g, makes it an element with impressive energy density. The key parameter here is the lifting capacity amounting to approximately 7.52 kg (force ~73.80 N), which, with such a compact shape, proves the high grade of the material. The product meets the standards for N38 grade magnets.

Pros and cons of rare earth magnets.

Pros

Besides their high retention, neodymium magnets are valued for these benefits:
  • They virtually do not lose power, because even after ten years the performance loss is only ~1% (according to literature),
  • Neodymium magnets remain highly resistant to magnetic field loss caused by magnetic disturbances,
  • A magnet with a shiny nickel surface is more attractive,
  • They are known for high magnetic induction at the operating surface, making them more effective,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to flexibility in forming and the ability to adapt to unusual requirements,
  • Huge importance in future technologies – they serve a role in computer drives, brushless drives, medical equipment, also technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which enables their usage in compact constructions

Cons

Characteristics of disadvantages of neodymium magnets: application proposals
  • At strong impacts they can crack, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
  • We recommend a housing - magnetic mechanism, due to difficulties in creating threads inside the magnet and complicated shapes.
  • Possible danger to health – tiny shards of magnets can be dangerous, if swallowed, which becomes key in the context of child safety. Furthermore, small components of these products are able to be problematic in diagnostics medical in case of swallowing.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

Pull force analysis

Maximum holding power of the magnet – what affects it?

The lifting capacity listed is a result of laboratory testing executed under specific, ideal conditions:
  • using a plate made of mild steel, acting as a ideal flux conductor
  • with a cross-section of at least 10 mm
  • with an ground contact surface
  • with direct contact (without coatings)
  • under perpendicular application of breakaway force (90-degree angle)
  • at conditions approx. 20°C

Determinants of lifting force in real conditions

It is worth knowing that the magnet holding may be lower influenced by elements below, starting with the most relevant:
  • Distance (between the magnet and the plate), since even a very small clearance (e.g. 0.5 mm) leads to a decrease in force by up to 50% (this also applies to paint, rust or dirt).
  • Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Material type – ideal substrate is pure iron steel. Cast iron may have worse magnetic properties.
  • Surface condition – smooth surfaces guarantee perfect abutment, which increases force. Uneven metal reduce efficiency.
  • Thermal factor – hot environment weakens magnetic field. Too high temperature can permanently damage the magnet.

Lifting capacity was assessed using a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas under parallel forces the holding force is lower. Additionally, even a slight gap between the magnet and the plate decreases the holding force.

H&S for magnets
Caution required

Before use, read the rules. Uncontrolled attraction can break the magnet or injure your hand. Think ahead.

Compass and GPS

GPS units and mobile phones are extremely susceptible to magnetism. Close proximity with a powerful NdFeB magnet can ruin the internal compass in your phone.

No play value

Absolutely keep magnets out of reach of children. Risk of swallowing is significant, and the effects of magnets clamping inside the body are very dangerous.

Risk of cracking

Watch out for shards. Magnets can fracture upon uncontrolled impact, launching shards into the air. We recommend safety glasses.

Data carriers

Equipment safety: Neodymium magnets can damage payment cards and sensitive devices (pacemakers, hearing aids, timepieces).

Thermal limits

Control the heat. Heating the magnet above 80 degrees Celsius will destroy its magnetic structure and strength.

Metal Allergy

A percentage of the population have a sensitization to nickel, which is the common plating for NdFeB magnets. Prolonged contact may cause an allergic reaction. We suggest use protective gloves.

Crushing force

Protect your hands. Two powerful magnets will snap together immediately with a force of several hundred kilograms, crushing everything in their path. Exercise extreme caution!

Dust explosion hazard

Combustion risk: Rare earth powder is explosive. Do not process magnets without safety gear as this risks ignition.

Pacemakers

People with a pacemaker have to maintain an large gap from magnets. The magnetic field can interfere with the operation of the life-saving device.

Security! Details about risks in the article: Magnet Safety Guide.