Robust bodypack receiver delivering clarity along the whole frequency spectrum for daily use on stage with Evolution wireless G4 In Ear Monitoring systems. Easy and flexible wireless synchronization between transmitter and receiver via infrared. Compatible with Sennheiser WSM control software for flexible frequency allocation. Up to 16 compatible channels. Transmission Range: 100 meters. High RF output power (up to 50 mW) depending on country regulations. Package includes: EK IEM G4 stereo receiver, 2 AA batteries, IE 4 earphones, manual. Dimensions: 82 x 64 x 24 mm. Weight: 125 g. Frequency: 516 - 558 MHz