1. Advanced wireless headphone with 2.1 sound channel 2. Using high stable phase lock function3. Excellent bass sound effect4. Effective distance for 40 metersTransmitter: * Radiate frequency: FM 49.85MHz * Radiate power: max. 120dB * 6F22(9V) battery, or used AC/DC adapter * Audio input: ≤500mV Headphone: *Size "AAA" x 2 (3V) *Receiver frequency: FM 49.85MHz *Audio frequency response: 50Hz - 15kHz (+/-3dB) *S/N: ≥45dB *Stereo separation: ≥25dB *Out put power: ≥50mW *Receiver distance: ≥40 meters (none impediment)
