When I put the headsets on the base unit (which is plugged in) the charging light for the headsets turns neither red nor green. No lights at all. Why

I have noticed the same thing on at least 2 models of Sennheiser headphones. In my experience, the light does in fact light up (albeit dimly) after about 15-30 seconds. This design flaw really limits usability for seniors, whose eyesight might not allow them to see it. But I will also say that we have never run into any other technical issue with this company's headphones. One last item, it might (emphasis on might) be due to the rechargeable batteries may need to be replaced. Unfortunately the only was to test this is the run them down all the way, and try to recharge them.

do they connect by bluetooth?

Thanks for your question. The transmitter connects to TV via analog RCA outputs or 3.5mm analog (headphone) jack. It has no bluetooth capability. World Wide Stereo – since 1979 – and a proud authorized Sennheiser dealer.

Who sells extra bluetooth rs120 headsets? i have seen some older rf versions of the 120 headset for sale but not the newer bluetooth version.

I never looked for the Bluetooth version, so I’m not sure. I vaguely remember seeing headsets on sale on EBay, and I believe that the manufacturer website has a link to a parts department.

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🎶 Elevate your TV time with wireless freedom and sound that speaks your language!

LONG LASTING POWER - Rechargeable AAA batteries deliver up to 20 hours of crystal-clear sound on a single charge.
ALL DAY COMFORT DESIGN - Lightweight on-ear fit with low headband pressure keeps you comfortable during marathon TV sessions.
INTUITIVE VOLUME CONTROL - Ergonomic dial right on the headphones lets you adjust volume without fumbling for remotes.
TAILORED AUDIO EXPERIENCE - Switch effortlessly between Speech, Music, and Neutral modes to match your mood and content.
UNINTERRUPTED LISTENING FREEDOM - Enjoy up to 60 meters of wireless range—move freely around your home without missing a beat.

The Sennheiser RS 120-W wireless headphones deliver crystal-clear stereo sound with three customizable sound modes, a lightweight and comfortable design, up to 20 hours of rechargeable battery life, and a 60-meter wireless range, making them the perfect companion for immersive TV listening without interruptions.

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€ 237.79

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GERMANYstore

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Control Method	Touch
Controller Type	Volume Control
Control Type	Volume Control
Unit Count	1.0 Count
Cable Length	2362.21 Inches
Item Weight	695 Grams
Carrying Case Battery Charging Time	20 Hours
Is Electric	No
Compatible Devices	Television
Cable Features	Without Cable
Additional Features	Wireless Audio
Specific Uses For Product	Music
Headphone Folding Features	On Ear
Headphones Ear Placement	On Ear
Style Name	RS 120-W
Color	Black
Battery Average Life	20 Hours
Battery Charge Time	20 Hours
Wireless Technology	Bluetooth
Connectivity Technology	Wireless
Headphone Jack	3.5 mm Jack

Sennheiser Consumer AudioRS 120-W On-Ear Wireless Headphones for Crystal-Clear TV Listening with 3 Sound Modes, Lightweight Design, 60 m Range and Convenient Transmitter/Charger Combo - Black

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