RF Amplifier: 1,To amplify all signals in the whole band; 2,Wireless repeater; 3,Easy installation; Applications:The Wide Band Selective GSM RF Repeater to expand signal coverage of signal blind areas where signal is weak or unavailable. Outdoor: Airports, Tourism Regions, Golf Courses, Tunnels, Factories, Mining Districts, Villages etc.Indoor: Hotels, Exhibition Centers, Basements, Shopping ...