... Signal Booster (Cellphone Signal Repeater, GSM Mini Repeater, Amplifier) Frequency(MHz)/Gain(dB): 890-915/50, 935-960/55 Mobile Signal Booster (Cellphone Signal Repeater, GSM Mini Repeater).Indoor Antenna ... cellphones.FEATURES:High gain, easy installation and operation.Full-duplex, single-port design.Use ALC technology, adjust extent automaticallyLED Light Working & Signal Condition ...