Sennheiser EW IEM G4-A Monitor Set, Evolution Wireless G4Full control over your performance everywhere, every day. The G4 In Ear Monitoring Sets make your gig an extraordinary experience not just for your audience, but also for you! The EW IEM G4 Wireless Monitor System from Sennheiser is part of the evolution family of wireless monitoring systems and includes an SR IEM G4 transmitter, a EK IEM G4 stereo receiver, a pair of IE 4 earphones, a rod antenna, GA 3 rackmount kit, and two AA batteries. This kit