Trantec S4000IEM In Ear Monitor System (IEM) STEREO !! The S4000 IEM is a UHF stereo In-Ear-Monitoring system designed for use where the extra facilities of the S5000 IEM are not required. The IEM4000-1 system comprises a transmitter and one beltpack receiver with earpieces. The transmitter is DC powered, via mains adaptor, and features a menu driven LCD control panel which can display the levels of both audio channels together, or an average of both along with the operating frequency or user name. LED's indicate stereo/mono and limiter operation. The receiver incorporates an LCD showing frequency information, volume control, frequency selection, 3.5mm stereo jack socket and LED's showing power and RF reception. S4000IEM: The complete set comprises:- The S4000 IEM system comprises of 1 x transmitter, 1 x receiver, x earpiece, all necessary antennae, power supply and alkaline batteries complete in a custom briefcase.