Sony MDR-RF4000K and MDR-RF810RK wireless headphones debut

Sony have outed a pair of new wireless headphones, the MDR-RF810RK and MDR-RF4000K, each a set of closed-cup cans intended for home entertainment use.  Of the two, the Sony MDR-RF4000K are probably the more interesting; they use a dual-band digital RF transceiver with 30m range, and have a 40mm long-stroke diaphragm.

They also fold flat for easy storage, and for docking into the combination case and recharging station.  Battery life from the standard NiMH pack is up to 10hrs, though you can also use an AAA battery for 7hrs use.

As for the Sony MDR-RF810RK headphones, they weigh a little less than their classier counterparts but don't fold flat.  They do get longer battery life, however; up to 13hrs with the NiMH pack or 28hrs with the AAA battery.  Audio quality might not be as strong, however, since they use analog RF not digital.  Both sets will be available in April 2010, pricing tba.

Press Release:

No fuss, no wires... just great-sounding home entertainment

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 headphone from Sony offers fabulous digital sound for your favourite AV entertainment. It's 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 headphone's closed-type design 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 headphone, 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.), the easy-to-wear cordless headphone 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 headphones are available from April 2010.