Note: The main function of this product is to shield EMF electromagnetic radiation generated by 4G, 5G, wifi and other signals; EMF electromagnetic radiation generated when making calls, sending and receiving short messages, and EMF electromagnetic radiation generated by small household appliances such as microwave ovens when working.
Note: The main function of this product is not to shield the signal of the mobile phone or pad. Simply wrapping the mobile phone with a hat to see if there is a signal will not be able to test the product performance correctly. If you need to test product performance, you need to use the emf electromagnetic radiation tester (the instrument in the main listing picture) for testing.
Note: The first time you wear it may be a little tight, but they have super elasticity, please rest assured to wear，Therefore, please measure your head circumference before buying
Excellent production and humanized design：The 100% nano silver fiber is between the interlayers of the woolen cap to ensure good warmth and comfort when wearing.
Nanometer silver fiber worsted technology, good shielding performance, light and thin material, good air permeability;
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SGL Anti-Radiation Sleep Beanie Hat Cap Effective Shielding Sign
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