Sennheiser XSW IEM SET Stereo In-Ear Wireless Monitoring System 
Key Features
Live Stage, Rehearsal, House of Worship
XSW IEM SR Stereo Transmitter
XSW IEM EK Stereo Receiver
IE 4 Stereo Earphones
960 Frequencies, 8 Banks
Integrated High-Boost EQ and Limiter
Stereo Panning, Focus Mode
6 Hours on AA Batteries
Includes Rackmount
Up to 12 Transmitters / 330' Range