After testing, it will not affect the WIFI signal. Increasing the Cooling column allows for better heat dissipation.Increase the cooling column to bring better heat dissipation to your for 3B/3B+. No longer worry about overheating.There is no need to install a fan. It also provides perfect heat dissipation.Durable, hard, long-lasting rust-free, wear-resistant, and can be well protected to your for 3B/3B+.All ports and slots of the case can fit perfectly with for 3B/3B+size:9.1x6.5x3.6cmMaterial:Aluminum alloycolour:blackPackage Contents:1 * Aluminum Alloy Cooling Case1 * Screw SetOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.