70dB 850MHz Cell Phone Signal Booster with Whip Antenna and Yagi Antenna Type: Booster Color: Black / White Compatible Phone Manufacturer: All phones work on 850MHz Compatible Carrier: All Carriers Work on 850MHz Support Network: GSM, CDMA, TDMA Coverage: 1500 sq ft Frequency: 824-849MHz/869-894MHz Gain: 70dB