Sony MDR-IF3000 Additional Infrared Wireless Dolby Digital Headphones for MDR-DS3000 Transmitter (Discontinued by Manufacturer) Extra set of infrared wireless headphones for Sony MDR-DS3000 transmitter Built-in Dolby Digital, Pro Logic II, and DTS surround decoders 23-foot transmission range and 90-degree transmission angle Extra-large 30 mm drivers create impressively real audio experience Includes volume control and rechargeable NiMH batteries; 1-year parts warranty