Sennheiser - Double Wireless In-Ear-Monitor System EW IEM G4-TWIN-B

Engineered for professional live sound: Rugged all-in-one wireless monitoring system for in-ear applications.
IEM Twin Set (1) SR IEM G4 stereo transmitter, (2) EK IEM G4 stereo bodypack receivers, (2) pairs of IE4 earbuds and (1) GA3 rackmount kit, range B (626 - 668 MHz), EU/UK/US adaptor