Reduces radio waves by covering. ＜M size: Opening approx. 25cm, Depth approx. 40cm＞ Wireless communication devices such as Wi-Fi routers that are turned on emit microwaves (high-frequency electromagnetic waves) that spread widely throughout the home, generating strong electromagnetic waves all day long. You are exposed to electromagnetic waves even during sleep. By placing a Wi-Fi router inside this Wi-Fi router electromagnetic wave reduction case, the electromagnetic wave intensity can be reduced. M size: Opening approx. 25cm, Depth approx. 40cm. L size: Opening approx. 32cm, Depth approx. 29.5cm, Gusset width approx. 15cm The attenuation rate graph is the attenuation rate of the fabric that makes up this product, not the attenuation rate of the product itself. Handling/Washing: Use neutral detergent (strictly no weak alkaline detergent), hand wash in water, air dry (shade drying), do not use fabric softener, do not use bleach (chlorine-based, oxygen-based, and baking soda are also not allowed), do not iron, do not dry clean.