Professional Series Dual band cell phone signal booster. Perfect product for professional installers. Ideal for small offices, warehouses, and large homes. Comes in a plain brown box that states For professional. installation only . Works with All carriers except Nextel. Increases indoor cell signal up to 10,000 sq. ft.. Extends phone battery life. Multiple users with one unit. Manufactured in the USA. Improves all cell phone applications including: sending and receiving calls, test messaging, downloads of Word and Excel documents, picture mail, internet browsing, 3G high-speed data, downloading ringtones, etc.. Cutting-edge and patent-pending technology that protects the carrier's network.Uses RG6 coaxial cable (standard satellite cable) - not included Power supply included. Bidirectional amplifier that transmits on the 800 MHz AND 1900 MHz frequencies Supports all modulations including, CDMA, GSM, TDMA, etc.