Specification: Item Type: Wireless Ear Monitor_x000D_Material: ABS_x000D_Frequency: 626-662MHz_x000D_Adjacent Channel Rejection: 70 DB_x000D_Intermodulation Attenuation: 70 DB_x000D_Receive Sensitivity: 20 dBuV_x000D_Antenna: 1/4 Wavelength Weaved Antenna_x000D_Headphone Output Interface: 3.5mm/0.1in Interface_x000D_Stereo Jack Headphone Output Power: 100mW (32 Ohms)_x000D_Maximum Current: About 190mA_x000D_Battery Life: 8 Hours_x000D_Receiver Battery: 2 x AA Batteries (Not Included)_x000D_Headphone Output Interface: 3.5mm/0.1in Stereo Jack Features: 1Unlimited Receivers: Wireless monitoring system, unlimited number for S3 receivers can be used on the same frequency. 2Frequency Band: 626 to 662MHz ear monitor system receiver, can only be used in this frequency band, with stable performance. 3Small And Lightweight: A compact bodypack ear monitor receiver that is lightweight and easily attached to a belt or guitar strap. 4Professional: Ear monitor return system is suitable for S3 wireless earphones, 3.5mm stereo output, giving you a better monitoring experience. 5Multiple Applications: Wireless ear monitor system is suitable for live broadcast listening at exhibitions, stage performances, band, etc. PackageList: 1 xWireless Ear Monitor (Battery Not Included) 1 x Headphone 2 x Pairs of Ear Covers