This product has a "neodymium magnet" sealed in the "magnetic pocket" of the main body to secure the bag to the iron door. The magnetic force of the neodymium magnets is very strong, so please handle with care as it may cause accidents if used outside of this product. ■This product uses magnets to secure the bag to the iron door.Magnets cannot be attached to doors other than steel, such as wood, glass, and aluminum, or even steel doors with uneven steel doors, so please check your front door before purchasing. ■ Please do not leave the magnet in a location accessible to small children. ■ Those who have equipped electronic medical devices such as heart pacemakers should not use it as a backpack while the magnet is left on the bag.Also, please refrain from getting magnets close to those who wear a pacemaker is very dangerous. ■ Extremely strong suction force between magnets and magnets, or magnetic objects such as magnets and iron pieces.When removing the magnet from the magnetic pocket, please be careful not to get pinched on your hands and fingers. - Grinding and cutting magnets may cause deterioration of magnetic properties and poor magnetism, and may cause injuries.Do not treat yourself. ■ Placing magnetic recording media such as magnetic cards near the magnet may destroy the data and become unusable for use.In addition, when close to precision electronic products such as electronic watches may cause malfunction.