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Sennheiser HDR 120

Extra headset for RS 135-9 wireless headphone system

5 Reviews | 3 questions - 3 answers

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Item # 143HDR120

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Our take on the Sennheiser HDR 120

Add an extra HDR 120 headset (or even two or three) to your Sennheiser RS 135-9 wireless headphone system and share the fun. Its open design delivers warm, detailed sound with plenty of bass. Cushioned earpads and headband make it comfortable to wear for hours.

Product Highlights:

  • add-on headset for use with Sennheiser's RS 135-9 wireless headphone system (sold separately)
  • RF wireless receiving range: up to 328 feet
  • each headset features a volume control, on/off switch, and tuning button
  • frequency response: 22-19,500 Hz
  • headphones use 2 "AAA" NiMH rechargeable batteries (included)
  • requires transmitter/base-station from RS 135-9 system for use
  • headset weight: 8.1 oz.
  • warranty: 2 years
  • Our 60-day money-back guarantee

What's in the Box:

  • HDR-120 Wireless on-the-ear headset
  • 2 "AAA" Ni-MH rechargeable batteries (1.2V/600 mAh)
  • Instructions (English/ German/ French/ Italian/ Spanish/ Portuguese/ Dutch/ Finnish/ Greek)
  • RS 120 connection diagram

Great sound and the distance you can go from the charging base and still have a clear signal is fantastic. Buy them.

Chris, Charlottesville, VA


Sennheiser HDR 120 Reviews

Average Customer Review(s):

(5 Reviews)
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Hands-on research

Product Research


Overview: The HDR 120 can be used as an additional headset for the Sennheiser RS 135-9 wireless headphone system with an open air, on-ear design. They are also compatible with the RS 120 and RS 110 wireless headphone systems.

Batteries: Power for the headset is provided by two rechargeable "AAA" batteries (included) that fit into a compartment in the headset. The batteries are recharged whenever the headset is placed on the transmitter included with the RS 135-9 system. Fully charged batteries have an operating time of approximately 20 hours. The RS 135-9 system manual recommends an initial charging of 24 hours before the batteries are first used, after that the normal charging time is approximately 18 hours.

Note: Only rechargeable batteries should be used.


  • Volume: thumbwheel volume adjustment; on the right earcup
  • Tuning: tune the headset to the transmitter for the clearest reception; on the right earcup
  • Power: turn the headset on/off; on the left earcup


  • Reception Frequency: 926-928 MHz
  • Modulation: FM stereo
  • Frequency Response: 22-19,500 Hz
  • Maximum SPL: 106 dB
  • Weight: 8.1 oz

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

They are wonderful but they wear out after 10 years or so. Bought here 'cause they told me about how to check my receiver which was still very good, only needing the earphones. Worth a bit more than some nobody selling the same thing cheaper which might take up my valuable time dealing with a mess....Thanks Mac!!! [ Joan  Jun 23, 2018 ]
Hearing impaired family member -for TV viewing. [ eric  Dec 06, 2017 ]
Zac was very helpful and I went with what he thought would work. [ DANIEL  Nov 15, 2017 ]
Replacing original pair that came with my RS 120. [ Jason  Sep 22, 2017 ]
Chance convinced me the headphones would work with my TR 120 transmitter [ James  May 17, 2017 ]
I talked with a professional and told him what I wanted and he found the product I needed and checked to see that it would do all I wanted [ lendell  Mar 13, 2017 ]
Because I need it. [ Bruce  Oct 19, 2016 ]
right price, right features [ Robert  Jun 10, 2016 ]

3 questions already asked

Thanks for your question. Crutchfield does not have the replacement covers. You can contact Sennheiser directly. Their Customer Support number is 860-434-9190 . Hope this helps. [ Kenny  Sep 25, 2017 ]  Staff
Thanks for your question. I'm sorry, no, there is no base included. On the main product page you can see what's in the box which is HDR-120 Wireless on-the-ear headset and 2 "AAA" Ni-MH rechargeable batteries (1.2V/600 mAh). For the base to be included you would have to purchase the RS 135-9 at the link below, hope this helps. [ Kenny  Mar 17, 2017 ]  Staff
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can help troubleshoot the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. You can also post your question in our forums: Or try our online support center: [ Kenny  Mar 06, 2017 ]  Staff

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