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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Description

🎶 Elevate your TV time with wireless freedom and crystal-clear sound!

ALL DAY COMFORT - Lightweight on-ear design with low headband pressure keeps you comfortable during extended viewing marathons.
INTUITIVE VOLUME CONTROL - Ergonomic dial right on the headphones lets you adjust sound levels without fumbling for remotes.
SEAMLESS SETUP CHARGING - Combo transmitter and charging dock with RCA and 3.5mm plugs ensures quick connection and hassle-free power-ups.
TAILORED AUDIO EXPERIENCE - Switch effortlessly between Speech, Music, and Neutral modes to match your mood and content.
UNMATCHED WIRELESS FREEDOM - Roam up to 60 meters from your TV without losing a beat—perfect for multitasking around the house.

The Sennheiser RS 120-W wireless headphones deliver premium stereo sound with three customizable audio modes, a robust 60-meter wireless range, and up to 20 hours of rechargeable battery life. Designed for comfort and ease, they feature an ergonomic volume dial and a convenient transmitter/charger combo for seamless TV connectivity and charging.

Specifications

Model Name	RS 120-W
Connectivity Technology	Wireless
Wireless Communication Technology	Wireless
Included Components	Headphones HDR 120-W, Transmitter TR 120-W with stereo RCA audio cable, Mains unit with country adapters (EU, UK, US, AUS), Two rechargeable batteries: 1.2 V (AAA), NiMH, Adapter for audio connection 3.5 mm, Quick guide & safety guide
Age Range (Description)	Adult
Material	Plastic
Specific Uses For Product	TV Listening
Charging Time	20 Hours
Compatible Devices	Television
Control Type	Volume Control
Cable Feature	Without Cable
Item Weight	695 Grams
Net Quantity	1.0 Count
Style	RS 120-W
Number of Items	1
Battery Life	2E+1 Hours
Audio Driver Type	Dynamic Driver
Earpiece Shape	On Ear
Series number	700171
UPC	810091270363
Special Feature	Wireless Audio
Global Trade Identification Number	04260752330367
Manufacturer	Sennheiser
Model	700171
Model Year	2022
Product Dimensions	19.5 x 8.2 x 19 cm; 695 g
Batteries	2 AAA batteries required. (included)
Item model number	700171
Special Features	Wireless Audio
Batteries Included	Yes
Batteries Required	Yes
Battery cell composition	NiMH
Cable feature	Without Cable
Does it contain liquid?	No
Includes Rechargeable Battery	Yes
Manufacturer	Sennheiser
Item Weight	695 g

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