New MDR-RF4000K digital cordless headphone

  • Digital RF headphone with 30m range and high quality sound
  • Smart storage and charging dock cuts living room clutter
  • High-comfort circum-aural design
  • Crystal clear sound thanks to 40mm long stroke diaphragm and Digital Radio Frequency transmission
Now there’s a smarter way to experience high quality sound in privacy and comfort while you’re listening to music or watching TV.
The luxuriously styled MDR-RF4000K digital cordless Sony headphones  offer fabulous digital sound for your favourite AV entertainment. They’re also designed to fit in perfectly with today’s living rooms, thanks to a unique new storage and charging dock that cuts unsightly wires.
Discreetly styled to complement the modern lines of your TV, the slim, convenient storage case doubles as a cable-free battery charger. After use, just fold the ear cups flat and the MDR-RF4000K stows neatly away while the battery recharges.
Digital RF transmission ensures clear, secure signal reception over a range of up to 30m. The closed-type design of the Sony headphones cuts sound spillage, so there’s no need to disturb others while you’re enjoying the action packed finale of a favourite movie.
Exceptional audio quality is assured by the headphone’s powerful 40mm long-stroke diaphragm. You’ll be rewarded with beautifully detailed, immersive reproduction of movie soundtracks and dialogue, music and more.
The closed-type design also features swivel circum-aural cushions and a parallel-link self-adjusting headband for superb wear comfort, even for extended listening periods. Thanks to a convenient volume control on the Sony headphones , there’s no need to reach for the remote to turn sound up or down.
The power-efficient design allows up to 7 hours continuous listening time between charges of the NiMH battery. Alternatively, slip in a single AAA alkaline battery and enjoy up to 10 hours listening without a break. An auto power-save feature switches off the headphone when it’s not being used, extending listening time still further.

Ultimate freedom: MDR-RF810RK cordless headphone

Also available this Spring, the MDR-RF810RK gives you supreme freedom to enjoy your hi-fi or TV in comfort and privacy, anywhere in your home.
Weighing just 220g (approx.), these easy-to-wear cordless Sony headphones  can receive analogue RF signals transmitted from the up to 100m away. Like the MDR RF4000K, it features a precision 40mm driver for uncompromised sound, plus a convenient volume control for easy level adjustment.
13 hrs listening time on a single charge of the NiMH battery is boosted even further to an incredible 28 hours uninterrupted listening on AAA alkaline battery power.
The new MDR-RF4000K and MDR-RF810RK wireless Sony headphones  are available from April 2010.
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Specification table

Features MDR-RF4000K MDR-RF810RK
Colours Black Black/Silver
Availability April 10 April 10
Versions EU8, CEK EU8,  CEK
Type Closed Closed
Freq. resp. (Hz) 12-22,000 20-20,000
Driver unit 40mm 40mm
Reception range (m) 30 100
Output power mW 10 + 10 3+3
Battery life (AAA/NiHM) 7h / 10h 28h / 13h
Charging time 16h 16h
Plug type Connecting cord mini to phono, unimatch plug Unimatch plug cord stereo to phono
Volume control Built-in Built-in
Channels 1 2
Key features Swivel flat
Charging dock / storage case
Stylish design
Auto On/Off
Circum-aural earcups
Accessories AC power adaptor AC power adaptor
Weight (g) 300 220

For more information please contact:

Silke Schild, Corporate Communications, Sony Europe
+44 (0)1932 816 507

About Sony Europe

Sony is a leading global innovator of audio, video, communications and information technology products for both the consumer and professional markets. Sony is renowned for its audio-visual products, such as the BRAVIA™ LCD high-definition television, Cyber-shot™ digital camera, Handycam® camcorder and Walkman® MP3 player as well as its VAIO™ personal computers and high-definition (HD) professional broadcast equipment, highlighted by the XDCAM® HD. Offering a complete end-to-end HD value chain and with its electronics, music, pictures, game and online businesses, Sony is one of the world’s leading digital entertainment brands, employing approximately 170,000 people worldwide.

Through its long-term football partnerships as an official sponsor of the UEFA Champions League until 2012, Official FIFA Partner until 2014 and global sponsor of the FIFA World Cup™ in 2010 and 2014, Sony is inspiring a sense of excitement for the millions of football fans around the world.

For more information on Sony Europe, please visit and

“Sony”, “Cyber-shot”, “Exmor R”, “Blu-ray Disc™”, “VAIO”, “XDCAM”, “Handycam®”, “Walkman®”, “BRAVIA™” and “Optical SteadyShot” are registered trademarks or trademarks of Sony Corporation. All other trademarks are trademarks or registered trademarks of their respective owners.