Cell Phone Signal Booster for Home and Office - Dual Band 700MHz Cellular Repeater for AT&T, Verizon and T-Mobile 4G LTE - Enhance Your Indoor Data and Voice Over LTE (Band 12/17/13)

Frequency Range: Band 12/17, Band 13 Max. Gain: 65dB Max. Output Power: 20dBm Automatic Gain Control: ?20dB I/O Port on booster: N-female Impedance: 50 ohm Power Supply: Input AC100~240V 50/60Hz, Output DC 5V The booster can only amplify signal but cant create signal, it wont work if there is no existing signal. Please make sure you can get 2 bars signal outside your house.The booster only supports cell phones on band 12/13/17. Please check your cell phone network band before purchase by the methods below.If your phone is band 12(17) or band 13, the booster is suitable for you. If not, please choose another booster according to your band.Dial *3001#12345#*, then press Call buttonClick Serving Cell InfoCheck Freq Band Indicator;Download and install "LTE Discovery" APP,Click ‘SIGNALS’ and check band number.