Cell Phone Signal Booster AT&T 4G LTE T-mobile Band17 Band12 Mobile Repeater Amplifier (Dual Panel) The SHWCELL cell phone signal booster repeater is High Gain 70dB, solve your poor signal reception problem inside your house and office. The SHWCELL cell phone signal booster repeater could work for Band 12 (ATT 700MHz Frequency range:728--746MHz, 698--716MHz ) The SHWCELL cell phone signal booster repeater could work for about 1500-2500 sq.ft in open space. If your outdoor si The SHWCELL cell phone signal booster repeater reduces dropped calls and improves the voice quality in your house or office by boosting your signal strength. This repeater kit is suitable for a large house or small office/home The SHWCELL mobile phone signal booster repeater could be used for home,office,villa,garage,basement and so on