Stay connected with the surecall Fusion Professional 4G LTE In-Building Cell Phone Signal Booster. A powerful cell phone signal booster for mid-size buildings that provides strong, reliable connections in areas up to 8,000 sq. ft. Fusion Professional significantly improves voice, text, 4G and LTE data speeds for all North American cell carriers with built-in 2XP technology which doubles uplink transmission power to maintain the cellular connection to the tower in the weakest signal environments. Assembled and tested in the USA with outstanding build quality, award-winning technologies, all-carrier compatibility and world-class support, the Fusion Professional is the premier cell phone signal booster for the mid-size commercial buildings and large residences. Color: Black.