Cell Phone Signal Booster for Home and Office - Boost 4G LTE Data for Verizon AT&T and T-Mobile - 65dB Dual Band 700MHz Band 12/17/13 Cellular Repeater kit with High Gain Panel/Yagi Antennas

Frequency Range: Band 12/17, Band 13 Max. Gain: 65dB Max. Output Power: 20dBm Automatic Gain Control: ?20dB I/O Port: 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. If there is no signal outside, it wont work, please make sure you get 1-2 bars signal outside.The booster can only boost signal for cell phones on band 12/17 and band 13, Please check which band your cell phone is using by the methods below: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.