... is available upon requestNo. of Channels1,2,4,6,8 for optionTransmission DistanceMax20KM(From Donor Unit to Remote Unit)Max Input ... Backup Power Supply(Optional)6hours/8hoursNMS Monitor FunctionReal-time alarm for Door Status, Temperature, Power Supply, VSWR, Output Power, Gain, ... (Optional)RS232+WirelessModem+ChargeableLi-ionBattery TETRA Fiber Optic Cellular Repeater for Mobile Phone Operators