OMNITRONIC UHF E-FLEX Bodypack 559-575 MHz is a pocket transmitter for wireless microphone systems. It uses PLL multifrequency transmission with 16 switchable frequencies in two groups and provides quick pairing with a compatible receiver. The transmitter has adjustable sensitivity, FM modulation, a 4-digit 7-segment LED display, charge-status indication, and an on/off/mute switch. It operates on two AA batteries and provides a range of up to 30 m with line of sight.