Headphones and earbuds · Sennheiser
Owners plug the BTD 700 into phones and computers to get better-than-stock Bluetooth to their Sennheiser headphones, and many hear clearer detail and instrument separation on lossless and high-resolution tracks.
Sound quality is clearly praised. Owners pairing the dongle with Momentum 4, Momentum 5 and HDB 630 headphones describe more small detail and better instrument separation on lossless music. One longtime Momentum 4 owner said it renewed their interest in headphones they had stopped enjoying.
The most specific complaint is about the companion app: a few owners say they lose access to Smart Control+ once the dongle is connected, while another says it still works if multipoint is turned on. Only a handful of owners raised this, too few to call it a pattern.
The Sennheiser BTD 700 is a small USB-C Bluetooth transmitter. It plugs into a computer, phone or tablet and sends sound to wireless headphones, earbuds or speakers. It is for people whose device's own Bluetooth can't use high-quality or low-delay formats like aptX Lossless or aptX Adaptive. It comes with a USB-A adapter.
| Type | USB-C Bluetooth audio dongle (transmitter), USB-A adapter included |
|---|---|
| Noise cancelling | |
| Battery life | |
| Charging | Powered by the USB port (5 V, 100 mA) |
| Bluetooth and codecs | Bluetooth 5.4 (class 1); aptX, aptX Adaptive, aptX Lossless, SBC, LC3 |
| Weight | About 2.2 g (dongle); about 3 g (adapter) |
| Water resistance | |
| Warranty | 1 year |
From the maker's spec page, checked October 7, 2026. A blank row means the maker does not state it.
It has no battery, so you never charge it. It runs on power from whatever it is plugged into. aptX Lossless and aptX Adaptive only help if your headphones also support them; with other headphones it falls back to basic Bluetooth (SBC). LC3 is the newer Bluetooth LE Audio format. At about 2 grams, you can leave it plugged into a laptop all the time.
Pick up to three. You get a page with just those, side by side, on the subjects owners raised.
After the first listen, owners keep using it because it gets past what their phone or computer offers on its own. One Samsung owner said the dongle sounds much better than the basic codecs their phone allows. Others rotate the same headphones between walks, the house and work, with the dongle doing the connecting. The neutral tuning suits owners who like to listen without changes, and some don't feel any need to EQ.
The adjustments are about sources and settings. The gain shows up on lossless or high-resolution files, and one owner pointed out that plenty of music sounds no different. Some reached for EQ: one Momentum 5 owner was disappointed at first but got the sound they wanted, including strong sub bass, after working through Sound Personalization, and another turned the bass down a little. One owner comparing several dongles heard little difference in sound between them and chose the BTD 700 because it was the easiest to pair: put the dongle and the headphones into pairing mode and they find each other.
What keeps working is the pairing. Owners describe the connection as smooth and use the dongle day to day across several Sennheiser headphones. One owner noted the firmware has not changed since release and the dongle control tool showed no updates available. The rough spots are in setup: one MacBook owner paired both the headphones and the dongle but got no sound after switching output to the BTD 700. A French-speaking owner noted a small drop in quality on devices without aptX Adaptive support, and another owner asked whether aptX Lossless works on a PC without getting a clear answer.
Long-term accounts are thin. Most of what owners wrote is about sound and first setup, not how the dongle holds up after months or years of use, so there is not yet enough here to say how durable it is.
From 0 owner accounts that said how long they have had it. Own one? Add how long yours has lasted.
Nothing has a clear majority against it yet. Counted from the owners who raised each subject, not from everyone. A subject is judged once at least 4 owners raise it.
15 more subjects came up from fewer than 4 owners each, which is not enough for a fair reading. To see how it stacks up, compare it with another machine.
The same owner, asked again at each point. Fills in as owners answer.
Two questions: how long you have had it, and anything you would like to say about it. Then we ask again as it ages. This helps our mission.
More in headphones and earbuds: Sennheiser Momentum 4, Sony XM6, Sennheiser M5.
Among the 0 owner accounts here that gave a duration, 0 described a failure.
Before you buy one used, ask the seller: how old it is, whether it was ever repaired and by whom, and whether any of the parts above have been replaced. Ask to see it run. A receipt tells you the warranty start date; most makers honour the term only for the first owner.
Public discussions we read and summarised in our own words. Nothing here was submitted to Still Kicks.
Counted from public accounts by people who said they own it, and summarised by Still Kicks in its own words. Not a manufacturer claim, a lab test or an estimate.
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