zBoost Antenna Booster for GSM, GPRS, EDGE, EVDO, 1xRTT, UMTS, HSPA, 3G, CDMA - Retail Packaging - Black High-performance dual-band cellular phone signal booster Coverage zone: 7,500 sq. ft. Reduces dropped & missed calls on all major 3G networks for multiple simultaneous users Supports multiple devices that use cellular signal including tablets & smartphones Ideal for larger residential use with marginal to reliable outside signal