zBoost ZB645SL Dual Band Cell Phone Signal Booster with Directional Antennas, up to 10,000 sq. ft. External directional antenna for increased system performance Indoor dome ceiling-mount antenna provides omnidirectional coverage Boosts performance on iPhone, Samsung, Android & other phones & mobile devices Automatically operates at maximum gain with no manual adjustments needed Increases signal up to 10,000 sq. ft.