Features: 1) VHF/RF wireless headphone 2) The antenna of receiver and transmitter is built inside 3) Two independent receiving bands for wireless headphone and FM radio 4) Can be used as a portable FM radio with auto-tuning function 5) Talk on internet with wireless headphone Specifications: 1) System: VHF/RF 2) Modulation: frequency modulation (FM) 3) Audio mode: mono 4) Operation distance: >30 meters (360? 5) Transmission frequency: 85.8MHz 6) Receiving frequency: 85 ~ 108MHz 7) S/N ratio: >50dB 8) Distortion: <2%THD 9) Frequency response: 30 ~ 20,000Hz 10) Power supply: a) Transmitter: DC 3V (2 x 1.5V AAA batteries) b) Receiver: DC 3V (2 x 1.5V AAA batteries) Inner packing: Dimensions: 20.5 x 20.5 x 9.0cm