Cell Phone Signal Booster for Home and Office - 65dB Dual Band 700MHz Cell Phone Repeater Boost 4G Data and Volte - Support All Cellulars on 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: 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 existing signal, the booster will not work for you. Please make sure you can get 2 bars signal outside your house.The booster only works with the cell phones on band 12/13/17. Please check your cell phone network band firstly 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.