The Wi-Fi Router Cover is easy to install. This metallic mesh box measures 12 x 9 x 3 inches and can fit large routers like the Comcast Xfinity or ATT Uverse. Router measurement with all the attachments is recommended prior to purchase. Allow a 1-inch breathing space for the wiring. A round opening is provided for coaxial cables to pass through. Place on a flat table or wall mount - also consider where the box will be placed when sizing. It's that easy! The stainless steel shielding device works like a Faraday cage or enclosure that helps reduce and inhibit about 95% of harmful EMF/RF waves emitted by routers at home and any place that uses wireless connectivity. Efficacy can be tested with an EMF radiation meter. Use of this box does not affect signal strength and range. Make the most out of wireless connectivity at home without any worries. Get your home router the highly useful Wi-Fi Router Shield and see (and feel) the difference!