Phonetone Cell Phone Signal Booster Repeater with Whip Antenna and Yagi Antenna (850/1900MHz) Frequency Range : 824-849MHz/1850-1910MHz,869-894MHz/1930-1990MHz Max. Output power: 27dBm Max. Gain (dB) :65dB I/O Port : N-Female on both ends / Power Supply : AC100~240V ; DC 12V/2A WORKS WITH ALL U.S. & CANADIAN CARRIERS: Verizon, AT&T, Sprint, T-Mobile, Straight Talk, and U.S. Cellular,Boost GSM W-CDMA cell signal to make call and send txt. FCC authentication certificated