Phonetone Band 2 Cell Phone Signal Booster with Whip 2 Antenna for AT&T Verizon Sprint T-Mobile Boost Signal (850/1900MHz Signal Booster) Frequency Range : 824-849MHz/1850-1910MHz,869-894MHz/1930-1990MHz Max. Gain (dB) :65dB / I/O Port : N-Female on both ends; Power Supply : AC100~240V ; DC 12V/2A Coverage up to 2100sqft,supports 50 simultaneous users,No more dropped calls. Boost GSM W-CDMA cell signal to make call and send txt,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 text. Simple and easy to install: The simple instructions and DIY installation make it easy to get your new booster set up and working quickly. All of the components you need for installation are included in the package with easy to read, step-by-step instructions.