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XBLUE, we will be doing our best for your health, trust, convenience, and needs. [Key Features] - Protect US from WiFi router's RF (EMF) electromagnetic waves. - Block router's RF at average 95.6% without any side effect (by our measurement) - Protect the RF using 2 ways: Reflect and Absorb - Materials: Polyester, Silver, Copper, Carbon based plastic - inch Size: (outer) 8.7" x 6.7" - cm Size: (outer) 22cm x 17 cm - Made in Korea [How to use] - Need to cover your router antenna fully - Using Direction: white mesh needs to be front side.