This Sennheiser EK IEM G4 stereo bodypack receiver operates on Frequency Range A from 516 to 558 MHz for reliable wireless monitoring. It features a clear backlit display, a robust metal housing with an integrated belt clip, and a top-mounted volume control with a headphone output. The unit shows some cosmetic wear and light scratches along the edges from regular use, but is fully tested and functional; please note that batteries are not included.