Dr Tech Cell Phone Wireless Signal Booster for Home or Office , Dual Band 4G 700MHz 1700 - 2100 MHz , for At&T Mobility , LTE (1710-1755 2110-2155) , Dual Band 1 Mini design beautiful looking and practical 2 Receiving and sending separation, easy installation and operation 3 Full-duplex design, low consumption, environmental protection 4 AGC ALC integration design, device stability total improvement 5 MCU singlechip control, monitoring device on running completely