The S4000 IEM is a UHF stereo In-Ear-Monitoring system. 

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-1 System comprises:-

1 x transmitter
1 x receiver
1 x stereo earphones
All necessary antennae, power supply and alkaline batteries complete in a custom briefcase.