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【Premium 304 Stainless Steel Material】Made of food-grade 304 stainless steel knitted mesh, this EMF protection faraday bag features uniform 10mm apertures, strong corrosion resistance and a long service life. It blocks over 99.9% of harmful router EMF radiation and 5G signals while allowing suitable WiFi signal penetration. 【Oversized Universal Fit】The 13x17.7" (33x45 cm) large wifi box cover works well with most home WiFi routers, modems and meter boxes with or without external antennas. The open-ended design enables easy installation and adjustment; you can freely wrap devices of different sizes as needed. 【Superior Breathable Heat Dissipation】Unlike fabric shielding covers, our stainless steel mesh router cover delivers good air permeability, helping ease router overheating risks brought by long-term covering. The rigid mesh structure can retain its shape well after years of use, with less risk of deformation or sagging. 【Adjustable Radiation Shielding】When using WiFi normally, you can cover only the antenna area to strike a balance between radiation protection and signal strength. When sleeping or away from home, fully wrap the entire router to enhance radiation shielding. The material is washable and reusable, simple to clean with water. 【Customizable & Reliable Construction】We support size customization to match different device needs. This faraday cage also works for EMF meter testing, equipment shielding and other scenarios. The 304 stainless steel material can sustain consistent shielding performance over extended use.