Wireless Headphones Sony MDR-RF811RK: A unique experience in HiFi qualityEnjoy superior audio experience with Sonys exclusive MDR-RF811RK wireless headphones. These headphones give excellent performance whether youre listening to music, playing games or watching movies.The headphones are equipped with 40mm Neodymium speakers.Listen to music in HiFi quality on a single charge for up to 13 hours.The sound is rendered in the frequency range from 20Hz to 20KHz . Freedom of movementThese headphones have a 100m wireless range which gives you freedom to roam. You can connect any device via the classical 3.5mm jack. These Headphones are supplied with a rechargeable battery, but commercially available (LR03 (size AAA)) dry batteries can also be used to power the headphones. Comfortable Soft-textured cushioned earpads ensure comfortable long-term wear, while the wide headband can be adjusted.