The versatile, reliable and long lasting Smoothtalker Stealth Z6 cellular signal booster will boost data, voice, and provide signal where you need it. The Smoothtalker Stealth Z6 is perfect for the home or buildings, with the options to mount antenna to the inside of a window for places where outside installation is not possible. While boosts all 4G, LTE and 3G signal for all networks, self-regulating and covers up to 12000 sq. ft.