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Sennheiser HDR 120

Extra headset for RS 135-9 wireless headphone system

Item # 143HDR120

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Item # 143HDR120

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About 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
  • MFR # 009931

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

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Sennheiser HDR 120 reviews

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6 reviews

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Crutchfield response

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More details on the Sennheiser HDR 120

Mark G.

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

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Customer Q&A

Crutchfield asked: Why did you buy this?
I have been using these for 2 yrs. I have hearing loss, and these make the TV programs much clearer. I'm ordering a second pair for company [ Linda  Aug 27, 2019 ]
I have a pr. Of these ,but only one side works. [ Joe  Feb 09, 2019 ]
Extra headphones for Sennheiser RS 135-9 [ Rowlan  Jan 21, 2019 ]
Have a set now but it is inoperable. The only thing I don't like about the system is that the head set does not fit well. If you bend over to pick something up they will fall off your head. [ Raymond  Jan 04, 2019 ]
We have had these earphones for years and the sound is perfect so I ordered another set.. [ Ida  Dec 12, 2018 ]
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 ]

4 questions already asked

no sound, I put new batteries in, still no sound? what can I do?
[ Kay  Apr 03, 2019 ]
7 answers
Do you have static if the TV is not turned on. You should if it is tuned properly, and audio turned up. If no, chances are the transmitter is not transmitting. Try a different channel on the transmitter. Are you getting audio out of the TV? Try swapping left and right channels. Sounds odd, but try licking the positive end of the batteries. Saliva is a conductor. Hope something works.
[ Paris M.  Apr 04, 2019 ]
Addendum to my earlier email answer: The customer mentioned that she put in new batteries. In order for the headphones be charged/recharged on the cradle, I believe that only rechargeable batteries as those that come with the headphones should be used.
[ GARY  Apr 04, 2019 ]
According to the instructions, the headphones need to be charged for 24 hours before use. This is done by placing them on the cradle (which, of course, needs to be plugged into a power source). A red light will appear. I then plug the wire from the cradle into the phone outlet on my receiver. I turn on the receiver and the on switch on the headphones. Additionally, the headphones need to be tuned by moving the tune dial on the headphones (as one would tune a radio dial to get a station). I recharge the headphones on the cradle every night, follow the above procedure, and they work beautifully.
[ GARY  Apr 04, 2019 ]
Try turning the little thumb wheel at the bottom of the right ear cup. If that doesn't work, return them for another pair.
[ Richard  Apr 03, 2019 ]
Since you have new batteries we can move on to other possibilities . Easiest first. Have you tried to adjust tuning dial on headset? Also, if you have a new TV it may not have analogue sound capability which is required for the Sennheiser HDR 120. Check your TV settings to make sure. If not, you will need a digital to analogue converter. Also be sure that cable connections in back of the 120 are plugged in securely. Mine we very snug and difficult to get good connection.
[ Chris  Apr 03, 2019 ]
Make sure the sound is turned up sufficiently from the device that the transmitter is plugged into. Tune the headphones with the tuning dial so that they are receiving sound from the transmitter. It is like tuning into an old style transistor radio. Make sure the volume is turned up sufficiently on the headphones themselves. Hope this helps.
[ Cory  Apr 03, 2019 ]
Is your charging stand connected to the correct sound output. We have ATT and the charging station has to the connected to their equipment not to the TV. I have also noticed if the batteries are not pushed in all the way then we have no sound.
[ Carol  Apr 03, 2019 ]
Where can I get new foam ear piece covers?
[ peg  Sep 24, 2017 ]
1 answer
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
RS 120 come with base chargeer?
[ Jonell  Mar 16, 2017 ]
1 answer
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
my headset just stop working can they be repaired?
[ James  Mar 05, 2017 ]
1 answer
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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