Dual band GSM 850/1900mhz Cellphone Signal Booster Repeater Amplifier Enhancer Type: Dual band Booster Repeater Color: Gray Compatible Phone Manufacturer: Phonetone Compatible Carrier: carrier frequency is 850/1900mhz Support Network: GSM,3G,LTE frequency is 850/1900mhz Coverage: 500-1000 square meters Frequency: 824-849MHz/1850-1910MHz 869-894MHz/1930-1990MHz Gain: 65dB gain