UDMS16BP MIC, UHF Body Pack System is for Professional audio system, Mic: Lavalier 16-channel PLL-synthesized UHF Receiver offers 16 user-selectable frequencies; 120 dB dynamic range; Operation up to 500' line-of-sight; Locking 3.5mm mini-jack provides secure connection for removable mic; Audio mute switch for transmitter; 1/2 rack receiver design.