... :DC2.2V~3.3V Receiving Distance:over 6m Infrared Wireless Stereo Headset (1CH), applicable to vehicle1,Power Supply:DC2.2V~3. ... 3V2,Working Current:25mA±5mA3,Receiving Frequency:L/2.3MHz,R/2.8MHz4,Receiving Distance:≥6m5,Frequency Response:20Hz~20KHz6,Power ... ratio:≥55dB8,Effective range (maximum): Approximately 10 m9,Power Supply: 2 × AAA Batteries10,Battery life: Approx 48 hours11,Audio Mode: ...