ASTRO Electromagnetic Wave Blocking Blocks Radio Shields Electromagnetic Prevents Electromagnetic Large Sheet, Silver, Waves, Waves, Waves, 821-18,

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Does this item require batteries? No [Product Specifications]: Size: Approx. 108 x 100 cm, Color: Silver, Contents: 1 sheet, Material: Polyester, Copper, Nickel [Electromagnetic wave shielding sheet made of special fabric]: A sheet that blocks and reduces electromagnetic waves from electrical appliances around you that emit electromagnetic waves that are a concern (PCs, smartphones, TVs, wireless routers, microwave ovens, etc.). [Prevents skimming and relay attacks]: Also prevents skimming, which extracts information stored on the magnetic strip of credit cards, and car theft, which exploits the properties of smart keys. [Note]: This product does not completely block communication radio waves, skimming, or relay attacks. It only blocks or reduces electromagnetic waves at certain frequencies.