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