Details : Cell phone becomes especially helpful when people get intocritical 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 phonebase station or located inside underground constructions, forexample: Parking lots, tunnels Big stores, office building Cars, boats etc. House in remote areas Office Area Factory Hospital Warehouse Home How Does It works : The outside antenna catches low signal from operatorservicer’s base station and delivers it to cell phone repeaterthrough the connection cable (coax).After the signal is accepted by the mobile repeater, thisdevice amplifies it.Then this amplified signal goes through the connectioncable (coax) to the inside antenna.And after that, the amplified signal transmits to your cellphone. Finally, your cell phone will get good signal, never on andoff.