... .Use ALC technology, adjust extent automaticallyLED Light Working & Signal Condition IndicatorsBig linear power, control inter-modulation & scatteration ... 2. To use this product to enlarge your signal, the outdoor signal shall be as good as possible . The ... , pls fee free to contact us. GSM/3G booster 980, GSM/UMTS980(900/2100MHz) GSM+3G,GSM booster,GSM repeater,UMTS booster,WCDMA booster,repeater