Stealth Z1 72 dB home and building boosters eliminate dropped calls, increase battery life and increase data speeds, for voice and data services simultaneously. The Z1 booster increases incoming and outgoing signals. The led console display signal level indicators make installation quick and easy. Features automatic oscillation control, network overload protection to maintain maximum gain automatically at all times. Stealth Z1 booster with 72 dB gain is recommended for areas within 10 mi. (15 km) of the cell tower. Covers up to 9500 sq. ft.