900-1800mhz dual band st-1090a details : cell phone becomes especially helpful when people get into critical situations. In case of emergency a timely call can save somebody’s life. Unfortunately, there are still some places where they can find themselves “out of coverage” no signal at all... Usually those places are either too far from the cell phone base station or located inside underground constructions, for example: parking lots, tunnels, big stores, office buildings, cars, boats etc. House in remote areas, office area, factory, hospital, warehouse, home how does it works :the outside antenna catches low signal from operator servicer’s base station and delivers it to cell phone repeater through the connection cable (coax).After the signal is accepted by the mobile repeater, this device amplifies it.Then this amplified signal goes through the connection cable (coax) to the inside antenna.And after that, the amplified signal transmits to your cell phone. Finally, your cell phone will get good signal, never on and off. St1090a mobile phone signal booster specification frequency range gsm 880-915 925~960mhz dcs1710-1785 1805-1880mhz gain up link: gp≥;63db downlink: gp≥;68db output up link :15dbm downlink: 17dbm function agc alc port vswr ≤1.8db i/o impedence 50ω/n connector noise figure ≤6db transmission delay ≤0.5μs ambient temperature -15°c~55°c power supply ac/220v±10% 45~55hz size/weight 130*95*28mm/450g coverage area 350sqm why choose lintratek?,excellent quality,exquisite appearance,high technology,considerate service,support multi users,full kit 1booster, 2antenna, 10 mtr cable with connector & 2mtr cable with connector,power adapter.