The UF-20TB is UHF PLL body-pack transmitter. 2400 to 3000 selectable frequencies. Preset 12 groups each of up to 63 compatible channels. Phase-locked loop (PLL) synthesized tune. Extended dynamic range and smooth frequency response. Adjustable transmission power between 10 and 50mW (depending on local regulation). The panel lock-on function prevents tampering and RF interruption. Together with JTS various music instrument mics, headset mics and tie clip mics this bodypack is versatile for all applications. It is designed with slot-in charging feature with two AA NiMH rechargeable batteries. Language selection.