zBoost Antenna Booster for CDMA, GSM, GPRS, Edge, 3G, at&T 4G LTE - Retail Packaging - Black High-performance AT&T 4G LTE cellular phone signal booster Coverage range: 5,500 sq. ft. Reduces dropped & missed calls & boosts AT&T 4G LTE data speeds for multiple simultaneous users Compatible with all cellular phones & devices that operate on CDMA, GSM, GPRS, EDGE, 1xRTT, UMTS, HSPA, 3G, AT&T 4G LTE, EVDO Automatically operates at maximum gain