Digital Antenna PowerMax Wireless Marine/RV Cell Booster dual band wireless cellular repeater operating on 850 and 1900 MHz bands. Boosts cell phones and air cards to 3 watts and improves transmit and receive signals. The result is clean and clear voice quality with maximum data throughput on all carriers except Nextel and iDEN. Not for use in open console boats. Amplifies cellular signal up to 20+ miles. Requires 12' separation plus a structure between inside & outside antennas. Includes 40 dB gain, 3 watt cellular repeater, 30' cable for external antenna, 18" external 9 dB gain antenna, internal 9dB gain directional antenna, 15' cable for internal antenna, 1"-14 threaded mounting ferrule, 1"-14 threaded mount and 12 VDC power converter.