Digital Antenna 824-894/1850-1990 MHZ (cellular/PCS) dual band wireless 40 dB amplifiers and kits for automobiles improve reception with up to 3 watts of power, reducing dropped calls and creating clearer and stronger signals. Available in single unit or with accessories for your vehicle. Wireless operation. No physical connection to cellphone, Extends the life of the battery, Enhances data connection for improved internet, fax and text messaging, Dynamic Variable Gain Control regulates signal to tower, Use with all 850/1900 MHz cell phones or air cards operating on any modulation including CDMA, GSM, TDMA, PCS, EV-DO, will not work on Nextel network), Requires a minimum separation distance of 5' (Auto) or 12' (Marine) and a structure between antennas (cannot be used in open console boats), FCC approved, Wirelessly enhances signals of multiple cell phones within a standard vehicle interior.