... Repeater is designed to solve problems of weak mobile signal in such place:far away from the ... requestNo. of Channels1,2,4,6,8 for optionTransmission DistanceMax20KM(From Donor Unit to Remote Unit ... Power Supply(Optional)6hours/8hoursNMS Monitor FunctionReal-time alarm for Door Status, Temperature, Power Supply, VSWR, Output ... ionBattery TETRA Fiber Optic Cellular Repeater for Mobile Phone Operators