What the maker puts in writing
- “NOTE: This product was designed for older televisions with Stereo Audio connectors or a headphone jack: newer televisions with HDMI or Digital Optical should instead use headphone model WH-L600”
- “Requires use of RCA Audio Out or Headphone Jack on television”
- “For Static sound issue, please refer the ‘trouble shooting steps’”
- 1.57 inch drivers · up to 20 hours · up to 150 ft
- Voice mode · noise reduction system
- In the box: WHRF400R Headphones, TMRRF400 Transmitter, AC Adapter, Stereo Mini Cable, RCA Plugs Adapter, Rechargeable Battery
- Catalog weight: 3 lb (1.4 kg) · Dimensions 9.80 × 7.24 × 13.5 in (249 × 184 × 343 mm)
A listing that names a different product to buy instead
“newer televisions with HDMI or Digital Optical should instead use headphone model WH-L600.”
That is remarkable, and it is the most useful sentence on the shelf. A maker is telling you, in its own product description, that if your television is recent you should buy something else.
And the bullet says the same thing as a requirement: “Requires use of RCA Audio Out or Headphone Jack on television.”
Both of those connections are disappearing. Televisions sold in recent years increasingly have only HDMI ARC and optical — no RCA output, no headphone jack.
So before anything else: look at the back of your set. If there is no RCA pair and no headphone jack, this product cannot connect, and no adapter on the shelf fixes it, because what is missing is an analog audio output.
Three of the twelve listings here are this same RF400 — $91.88 renewed, $138 new, $189.99 bundled — and all three carry the warning.
Why renewed is the sensible way to buy this one
At $91.88 against $138 for the identical WHRF400, this is $46.12 cheaper, which is a third off.
Renewed means inspected and resold, typically with a shorter warranty than new. On a product whose weakest part is a sealed rechargeable cell, that is the thing to weigh — a used battery has already spent some of its life.
But the figure that justifies it: the third listing of this same model, the $189.99 bundle, costs $98.11 more than this one and adds a protection plan, a case, some unspecified in-ear headphones of random color, and two USB-C adapters for a port the RF400 does not have.
1361 g is exactly 3.00 lb, and the shelf proves what it is.
Same model, three listings: the new RF400 at $138 publishes 277 g (9.8 oz), the $189.99 bundle publishes 277 g (9.8 oz), and only this renewed listing publishes 3 lb (1.4 kg). Both this and the new listing even share the dimensions 9.80 × 7.24 × 13.5 in (249 × 184 × 343 mm).
Three pounds is what the box weighs: headphones, the TMRRF400 transmitter, AC adapter, stereo mini cable, RCA plugs adapter.
Take 277 g (9.8 oz) as the number you will wear. On this shelf: Holdsound 250 g (8.8 oz) · Earbay 255 g (9 oz) · Sony 277 g (9.8 oz) · Sennheiser RS 386.5 lb (175.3 kg) · RS 430.9 lb (195.5 kg).
Analog RF: what it costs, and what it buys
This is the real division on the shelf, and it runs between three technologies.
Analog RF — the three Sony RF400 listings.
Digital proprietary — the three Sennheisers.
Bluetooth — the three Earbay, the Holdsound, the 1Mii, the Avantree.
What analog costs is written in Sony’s own bullet: “For Static sound issue, please refer the trouble shooting steps.” Analog radio degrades like FM radio degrades — gradually, into hiss, as the signal weakens or something interferes. There is a noise reduction system on board, and the range is 150 feet, but at the edge of it the sound goes noisy rather than silent.
The Sennheiser RS 120-W at $159.95 sells itself on precisely this: “Digital wireless transmission ensures no analog static.”
What analog buys is something Sony never advertises. An analog link has no buffer. There is nothing to fill, nothing to decode, nothing to re-clock — so there is essentially no latency at all.
That is why none of the three Sony listings publishes a latency figure while five cheaper products are proud of staying under 40 ms. The three products on this shelf with the least delay are the three that publish no number.
The only driver size on the shelf
1.57 inch — about 40 mm.
No other listing here publishes a driver diameter. Not the Sennheisers, not the Earbay listings, not the Avantree.
Forty millimeters is a normal full-size headphone driver, which tells you this is a proper over-ear design rather than something built down to a price.
Voice mode, and the noise reduction system
Voice mode is the feature that matters most for the actual use, and it is what most of this shelf is sold on: lifting speech out of a soundtrack so dialogue is intelligible without turning everything up.
Worth noting where the shelf stands on it. The Sennheiser RS 120-W at $159.95 publishes three profiles — “Speech, Music, Neutral”. The RS 195 at $264.03 has Speech Mode and Music Mode. The 1Mii at $89.99 has TV, Movie, Music.
And the $249.95 Sennheiser RS 175 has Bass Boost and Surround Sound — and no speech mode at all, which makes it the odd listing on a shelf about dialogue.
The noise reduction system here is a different thing: it addresses the hiss of the radio link, not the noise in the room.
What is not published
No latency figure — though it has the least on the shelf.
No frequency response and no signal-to-noise ratio. Only the Sennheiser RS 195 publishes a measurement here: “Analog input: typ. 85 dBA at 1 Vrms, Digital input: > 90 dBA”.
No weight you can trust, as above.
No volume limit, on a product sold for dialogue amplification. Only the Avantree at $159.99 addresses that subject, by stating plainly that it is “not for users with severe hearing loss”.
And the rechargeable battery is listed in the box but not as a serviceable part. Only the Sennheiser RS 120-W publishes replaceable cells — “1.2 V (AAA), NiMH” — which on a renewed purchase is worth thinking about, since this cell has already had a previous owner.
Prices quoted in this text were read on October 4, 2026. The live price is at the top of the page.
