The larger Router Guard is specifically design to fit and block the RF, radio frequency, waves emitted by the larger WiFi routers on the market. This Large Router Guard is 12 inches by 12 inches by 6 inches and fits Comcast xfinity router.
The Large Router Guard uses the same proven Faraday cage technology that the standard Router Guard uses blocking about 95% of the RF. You will still be able to get a WiFi signal with the large Router Guard installed but the distance you can be to the router and still get a signal will be reduced by about 40% to 60% depending on the router you have.
If your router is smaller than 12 inches by 9 inches by 3 inches, please order the standard Router Guard. If your router is larger than this, you will need the Large Router Guard.