zBoost ZB545X SOHO Xtreme Dual Band Cell Phone Signal Booster for Home and Office, up to 5,500 sq. ft. Dual band signal booster increases indoor cellular signal for voice and text for all major US carriers - coverage up to 5,500 sq. ft. (up to 77 dB system gain) Reduces dropped and missed calls and provides faster 3G data performance for multiple simultaneous users Ideal for homes or offices that have reliable outside signal Uses indoor panel antenna for better in-building signal penetration Boosts performance for iPhone, Samsung, Android and other phones and mobile devices