Multi-function LCD display for channel/frequency, sensitivity, battery status indicator, Alkaline/NiMH battery selection. Patented IrDA technology for 2-way data transfer between transmitter and receiver. 100 frequencies agile in 25 MHz bandwidth. Uses 2 x AA batteries to operate. Long operating time up to 16 hours. Standard 4-pin mini XLR connector. MT and GT gain controls for beltpack microphones.