Features: brand new and high quality Infrared wireless stereo headphone (2channel) for cars. Ergonomic design for comfortable use. Auto power off and auto power off function in headset. Collapsible design for easy transport. 3.5mm Auxilary port. Allows plug in use on any for Ipad/Pod, MP3 devices that uses a 3.5mm auxillary cord (cord not included). Specifications: Dual channel for carrier frequency: one channel: 2.8mhz for right channel; 2.3mhz for left channel channel b: 3.8mhz for right channel; 3.2mhz for left channel speaker: 40mm mylar cone impedance: 32° ± 15% effective range (maximum): about 10 meters power supply: 2 x aaa batteries battery life: about 48 hours for w/n ratio: ≥ 70db channel separation: ≥ 40db frequency response: 30~20,000hz audio model: stereo Package Includes: 1PC x Infrared Stereo Headset note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.