... booster 980, GSM/DCS980(900/1800MHz) GSM+DCS booster, repeater Dualband GSM 900mhz +1800mhz signal booster 980, GSM/DCS980( ... communications cannot work well due to leak of signals. The repeater device features easy installation & operation, build-in indoor ... device for boost mobile phone signal. A mobile phone repeater could also improve indoor electromagnetism environments, protract cellular battery ...