The new IEM600 offers 16 switchable UHF frequencies and has been updated with a high quality input stage for better dynamics and sound performance.The extremely strong and lightweight receiver, the IEM600 R, is equipped with a 3.5mm mini jack-socket for the earphones, a volume control and an on/off/mute button with LED indication. The separate on/off button allows switching without changing the volume. FEATURES:[ In-Ear Transmitter [ 16 frequencies switchable [ 9.5in housing [ Balanced Input [ Limiter und Compander circuits [ Input/Peak monitoring ";