HomeGadgetsMedia GadgetsSony MDR-RF4000K and MDR-RF810RK Headphones

    Sony MDR-RF4000K and MDR-RF810RK Headphones

    Sony MDR-RF4000K and MDR-RF810RK Headphones

    Sony’s latest offering, the MDR-RF4000K digital cordless headphones, include a unique new storage and charging dock and an impressive wireless range of 100ft. The storage doubles as a cable-free battery charger. After use, just fold the ear cups flat and the MDR-RF4000K cans stows away neatly while the battery recharges.

    Sony MDR-RF4000K Headphones

    Sony says digital RF transmission ensures clear, secure signal reception over a range of up to 30m. The headphones’ closed-type design cuts sound spillage, which means you won’t disturb others while wearing them and high-end audio quality is delivered via a 40mm long-stroke diaphragm which accurately reproduces the sounds you are intended to hear.

    Whamberry Handheld Keyboard & Mouse

    The unit has swivel circum-aural cushions plus a parallel-link self-adjusting headband for wear comfort. The volume control on the headphones lets you continue your listening enjoyment without having to reach for a separate remote.

    Sony MDR-RF4000K Headphones 2

    The headphones’ NiMH battery is said to last for up to seven hours of continuous listening between charges and can be supplemented by a single AAA alkaline battery for up to 10 hours listening without a break. An auto power-save feature switches off the headphones when they are not being used, extending listening time even further.

    Sony MDR-RF4000K Headphones 3

    Also released by Sony and available this Spring is the MDR-RF810RK which has a wireless range of 100m. Weighing just 220g, the cordless headphones also feature a precision 40mm driver for uncompromized sound, plus a volume control for easy adjustment. It boasts 13 hours of listening time on a single charge while one AAA alkaline battery will power the device for up to 28 hours . The new MDR-RF4000K and MDR-RF810RK wireless headphones are available from April 2010. No word on pricing just yet. (

    Published on March 26, 2010

    David Novak
    David Novak
    For the last 20 years, David Novak has appeared in newspapers, magazines, radio, and TV around the world, reviewing the latest in consumer technology. His byline has appeared in Popular Science, PC Magazine, USA Today, The Wall Street Journal, Electronic House Magazine, GQ, Men’s Journal, National Geographic, Newsweek, Popular Mechanics, Forbes Technology, Readers Digest, Cosmopolitan Magazine, Glamour Magazine, T3 Technology Magazine, Stuff Magazine, Maxim Magazine, Wired Magazine, Laptop Magazine, Indianapolis Monthly, Indiana Business Journal, Better Homes and Garden, CNET, Engadget, InfoWorld, Information Week, Yahoo Technology and Mobile Magazine. He has also made radio appearances on the The Mark Levin Radio Show, The Laura Ingraham Talk Show, Bob & Tom Show, and the Paul Harvey RadioShow. He’s also made TV appearances on The Today Show and The CBS Morning Show. His nationally syndicated newspaper column called the GadgetGUY, appears in over 100 newspapers around the world each week, where Novak enjoys over 3 million in readership. David is also a contributing writer fro Men’s Journal, GQ, Popular Mechanics, T3 Magazine and Electronic House here in the U.S.

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