Pioneer SE-DIR800C Wireless Headphones with Dolby Headphone Technology Wireless 5.1 surround sound headphones with Dolby Headphone multichannel technology Support for Dolby Digital, DTS, and Dolby Surround formats; transmission range of up to 26 feet Produces up to 5 virtual loudspeakers in your head to create an immersive surround experience Small, medium, and large "virtual room" presets based on acoustical measurements of actual rooms Built-in volume control; includes transmitter and rechargeable AA batteries; 90-day warranty