DEEPER PROTECTION The wifi cover could reduce harmful emitted from router, the router cover is made by superior Copper/ Nickel/Polyester Fiber fabric which is certified to provide 99.999% protecting. The wifi cover is designed by two sides open, you could choose different level blocking strength by opening the side or closing the side. The closer, the blocking performance will be better. You could tie up the two open sides to let it closed FRIENDLY DESIGN Truthly, the router cover does well in shielding, but it may have a little affection to the wifi signal. We suggest not wrapping the router completely, you could only wrap partial of it when using wifi. When you sleep or dont need to use wifi, we suggest wrapping the router completely. It is very easy to use, cover the router entirely, especially cover the router antenna. Then it can play its function TESTING OF BLOCKINGAll the tests are real, we tested a high-power router,the reading is obviously been reduced. The reading ma