The Sennheiser XSW IEM Set-C is a complete wireless in-ear monitoring system for musicians, worship teams and presenters who want to hear their own mix clearly on stage instead of relying on floor wedges. It includes a rugged metal-housed XSW IEM SR stereo transmitter with removable antenna and rack mount kit, a lightweight XSW IEM EK stereo bodypack receiver, IE 4 in-ear headphones with exchangeable ear sleeves, two AA batteries and an NT 12-5CW power supply with country adapters. Eight pre-configured frequency banks with 12 aligned channels each keep the UHF link reliable, and this Set-C variant operates between 662 - 686 MHz. Audio modes cover mono, stereo and a two-channel focus mode, and the bodypack has a stage-proof panel, status LED, LC display, balance control and a treble-enhancing EQ setting. Audio response is 45 Hz to 15 kHz with THD of 1 percent or less, and the receiver runs about 6 hours on two AA batteries. The transmitter measures approximately 200 x 128 x 42 mm. Also supplied: quick guide, safety guide, compliance sheet and frequency table.