Smoothtalker Stealth Z1 65dB Cellular Signal Booster Kit 2 year warranty - Made in North America Covers up to 6,500 sq. ft., recommended for areas within 10 mi. (15 km) of the cell tower. FCC Certified Rugged long lasting cast aluminum housing with LED performance indicator lights and High gain directional external antenna Stealth Z1 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.