1. DIGITAL DISPLAY: IEM system receiver is equipped with an LCD screen that displays frequency, channel and battery level for easy operation. 2. EFFICIENT RECEPTION: Wireless IEM system receiver uses 670-680Mhz frequency band, which is to receive RF signals from the transmitter. 3. STABLE SIGNAL: Wireless monitor system receiver antenna adopts 1/4 wavelength design to enhance signal reception. 4. EASY TO CARRY: IEM receiver runs on 2 x AA 1.5V batteries, and portable, and can be used up to 50 meters indoors and over 100 meters outdoors. 5. CLEAR SOUND: Stereo IEM system receiver frequency response covers 20Hz to 18KHz, providing a clear, HiFi sound experience. Item Type:Wireless Monitor System Receiver Battery:2 x AA 1.5V Batteries (Shipped Without Batteries) Use Distance:Indoor 50 Meters, Outdoor More Than 100 Meters Frequency Response:20Hz to 18KHz Antenna:1/4 Wavelength Frequency Band:670-680Mhz Color:Black Material:Plastic Package Contents: 1 x Receiver 1 x Headphones 2 Pairs x Ear Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.