DescriptionIn-car RF Wireless Headphone with 3 channelsSpecifications1) 49MHz wireless headphones with adjustable headband2) Twin receivers on each headphones3) Thick foam on earpiece for comfort4) Auto off integrated circuit safes battery life5) Personal volume control for each headphone6) Crystal turning eliminates the need for fine-turning7) A/B/C switch for channel selection8) Compatible with all in-vehicle audio/video applications9) Requires 2xAAA batteries per headphone(not included)Accessories1) Audio cable2) AAA Batteries3) Guarantee letter