Product Origin: China Brand Name: OEM Other Price Terms: EXW, FOB Shenzhen Payment Terms: T/T Supply Ability: 40,000pcs/month Minimum Order: 3,000pcs Delivery Lead Time: 25 days In-Car IR Wireless Headphones View Larger Picture Detailed Product Description Features: 1) IR-307 infrared wireless stereo headphone (1ch) for cars 2) IR-307D infrared wireless stereo headphone (2ch) for cars 3) Ultra lightweight design for comfortable wearing 4) Auto mute and auto power off function on headphone 5) Folding design for headphone Specifications (IR307): 1) Single channel 2) Carrier frequency: a) Right channel: 2.8MHz b) Left channel: 2.3MHz 3) Speaker: 30mm mylar 4) Cone impedance: 32O?5% 5) Effective range (maximum): about 10 meters 6) Audio mode: stereo 7) S/N ratio: =60dB 8) Channel separation: =40dB 9) Frequency response: 30 ~ 20,000Hz 10) Power supply: 2 AAA batteries Specifications (IR307D) 1) Dual channel 2) Carrier frequency: a) A channel: 2.8MHz for right channel; 2.3MHz for left channel b) B channel: 3.8MHz for right channel; 3.2MHz for left channel 3) Speaker: 30mm mylar 4) Cone impedance: 32O?5% 5) Effective range (maximum): about 10 meters 6) Power source: 2 AAA batteries 7) Battery life: about 48 hours