Cel-Fi PRO LTE/4G/3G Signal Booster for AT&T http://5gstore.com/product/6588_cel-f... Reduce Dropped Calls and Dead Zones. All you need is 1 bar of usable service on your phone to improve cellular coverage. -Easy to Install-True Plug and Play, Self-Configuring, No Cabling and --Professional installation NOT required! -Cel-Fi is the ONLY Cellular Signal Booster Authorized for use on the AT&T Network, -The Cel-Fi All Digital Booster can cover up to 13,000 sq. ft., making it IDEAL for Homes and Offices. -Cel-Fi has been approved by the FCC for 100dB Gain-Providing a LARGER Coverage Area and 1000 Times Greater Gain than current analog boosters. -Each Cel-Fi system can SUPPORT up to 60 Concurrent Users. All Digital Simultaneous Voice and Data 3G/4G/LTE (Quad Band MHz 700, 850, 1200/1700, 1900).