Features: 1.Adjustable soft padded headband and over ear earpads are designed to provide maximum comfort. 2.Free your movement and enjoy high sound quality wherever you are. 3.5 in 1 design: Wireless headphones, wireless internet sound chat, wireless monitoring, wired headphones and FM radio with FM transmitter up to 10m. 4.Wireless reception from any device with sound output including TV, DVD, MP3, CD, PC and HiFi. 5.Experience premium sound quality with the 5 in 1 Wireless Headphones designed to deliver high definition and balanced sound. specification:Item Type: Wireless Headphone Receiving frequency: 86-108mhz Loudspeaker diameter: 40.00 mm Modulation mode: FM/RF Impedance: 32 Launch distance: 30M(360 degree open space) Maximum output power: 3mW Sensitivity: 110DB S.P.L. at 1KHz Transmitting power: 5MV Working voltage: 3.0v (2AAA) Rated power: 15mW Operating current: 12mA Dynamic operating current: 5mA Power capacity: 150mW Working voltage: 3.0v (2AA) SNR: greater than 45DB Frequency response: 20HZ to 20KHZ Power by: 4 x AAA Batteries ( not included) Notes: 1. Manual measuring, please allow 1-3mm error, thank you. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. PackageList:1 x Transmitter1 x SoundCable1 x Wireless Headphone1 x User Manual