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  13. Sony MDRRF855RK over-ear wireless headphones

Sony MDRRF855RK over-ear wireless headphones

Sony MDRRF855RK over-ear wireless headphones Product no.: 9000-0021-3710 Warranty period: This product comes with a 3-year warranty.


Relaxing on the couch with your favourite music or film, without being in any way hindered by tangling cables that are always just a little bit too short? With these wireless headphones by Sony, it's possible!


Powered by a built-in Ni-MH battery, these headphones have an impressive 18-hour playback time. If that's not long enough for you, you can also choose to use alkaline batteries, extending the battery life with another 10 hours! The built-in battery is easy to charge, all you have to do is place the headphones in their docking station and seven hours later, they'll be good to go. This docking station also doubles as the transmitter that sends the audio signal to your headphones. You can easily connect it to an audio source using the mini jack connectors, after which it offers you a wireless range of up to 100 metres!

Sound reproduction

As far as audio quality goes, these Sony headphones are absolutely excellent. Their 40mm neodymium drivers allow for a balanced and detailed sound, which is further enhanced by the 10 - 22,000Hz frequency range. As such, even the smallest details will remain clearly audible at all frequencies and volumes, without distorting the sound. You can even choose to boost the low frequencies, which is especially effective for films and sports programmes. Finally, you can adjust the volume on the fly, using the simple slider that's built into the headphones.


Product features

  • Active noise reduction no
  • Wireless yes
  • Rotatable earpiece no
  • Headphone construction half open
  • Headphone impedance not applicable
  • In/on/over-ear over-ear
  • Includes microphone no
  • Collapsible no
  • Adjustable bass boost yes
  • Removable cable no
  • Cable length not applicable
  • Colour black
  • Maximum frequency 10 - 10.9 kHz
  • Minimum frequency 20 - 21 Hz
  • Type of audio connector jack 3.5 mm TRS
  • Volume control yes

Weight and dimensions including packaging

  • Weight (incl. packaging) 1.2 kg
  • Dimensions (incl. packaging) 31.0 x 23.0 x 12.0 cm

Product specifications

  • wireless headphones
  • colour: black
  • RF stereo transmitter
  • 2x stereo mini jack
  • 40mm neodymium drivers
  • frequency range: 10 - 22,000 Hz
  • power: Ni-MH battery
  • playback time with charged battery: 18 hours
  • playback time using alkaline batteries: 28 hours (not included)
  • comfortable, soft ear pads
  • comes with 12V mains power supply


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