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[Electromagnetic Wave Blocking] Cuts a specific frequency of 99.9% by simply attaching it to your appliances. ※Please be aware that this product is delivered by mail bin and we cannot accept the delivery date and time of delivery cannot be specified. We are surrounded by electronic products that use many semiconductors such as mobile phones, computers, and other products we use in our daily life. The electromagnetic waves produced by semiconductors have been released recently in the World Health Organization (WHO). Electromagnetic waves have been treated as important challenges as well as the 21st century cigarettes. The manufacturing process is chrome plated with a base of nickel and special metals. Prevents metal oxidation deterioration and can be used forever. How to use: Apply the electromagnetic wave blocking sticker to your household appliances (TV, PC, microwave, cell phone, shaver, dryer), etc. Contents: 5 pieces of electromagnetic wave blocking stickers, Sticker Size: 0.8 x 0.6 inches (20 x 15 mm) (Thickness: Approx. 0.00 inch (0.2 mm)), 99.9% (Measurement Range: 30 - 1,000 MHZ 100 - 110dB).