The HiBy W5 is a small wireless Bluetooth dongle designed to clip onto a pair of IEMs and pair with your phone, letting you go wireless without giving up a real DAC/amp stage in between. At $109 it sits in an interesting spot: cheap enough to be an impulse buy, but built around HiBy’s own UAT protocol, which is the kind of detail that actually matters once you start using it daily. I have been living with one clipped to my IEM cable for a while now, and the way I got to know its quirks followed a pretty clear timeline.
| Spec | Detail |
|---|---|
| Brand | HiBy |
| Model | W5 |
| Type | Bluetooth clip-on DAC/amp dongle |
| DAC/Amp Chip | ES9218P |
| Bluetooth Chip | Qualcomm CSR8675 |
| Output Power | 80mW+80mW at 32Ω |
| Wireless Protocol | UAT (up to 192kHz/1.2Mbps), Bluetooth 5.0 with LDAC fallback |
| Battery | 150mAh, plus a 1000mAh charging cradle |
| Water/Dust Resistance | IPX67 |
Day one: unboxing and first impressions
Out of the box, the W5’s pebble-stone shape is the first thing you notice. There are no buttons cluttering the surface, just a smooth, glossy shell over a stainless steel back with a brushed finish. It is genuinely tiny at roughly 60mm x 20mm and 18g, light enough that clipping it to an IEM cable does not feel like it is dragging your ears down. HiBy also rates it IPX67 for water and dust resistance, which matters more than it sounds once you factor in gym sessions or getting caught in light rain on a commute.
Week one: getting familiar with UAT and Bluetooth pairing
The W5’s real party trick is HiBy’s own UAT protocol — Ultra Audio Transmission — which can push audio at up to 192kHz sampling or up to 1.2Mbps bitrate when paired with a UAT-compatible source, well beyond what standard Bluetooth codecs typically manage. If your phone or player is not UAT-compatible, the W5 falls back gracefully to standard Bluetooth 5.0 with LDAC support, so you are not locked out of decent wireless audio quality either way.
Under the hood, the W5 pairs an ES9218P DAC/amp SoC with a Qualcomm CSR8675 Bluetooth chip, delivering 80mW+80mW at 32ohm, THD+N of -103dB, and an SNR of 118dB on paper. In casual listening, the difference between UAT and standard Bluetooth was noticeable mostly with well-recorded, higher-resolution tracks; on more compressed streaming content, the gap narrowed considerably. Reviewers at Headfonics and Head-Fi’s community thread both described the sound as clean with a notably dark, low-noise background, which matched my own impression.
Week two: the charging cradle becomes the real story
This is the part that took me longest to appreciate. The W5’s internal battery is small — just 150mAh, rated for roughly 4 to 5 hours of playback on its own. That sounds thin until you factor in the included charging cradle, a 1000mAh case the W5 clips into between listening sessions. Across about 5 recharges from that cradle, total usable battery life stretches to somewhere around 20 hours, which reframes the whole design: the W5 is not meant to be topped up from a wall charger constantly, it is meant to live in its cradle in a bag or pocket and get quick top-ups between listening blocks.
Once that clicked for me, the small internal cell stopped feeling like a limitation and started feeling like a deliberate tradeoff for keeping the dongle itself so light and unobtrusive on the cable.
Ongoing use: controlling it through the HiByMusic app
Day to day, the W5 pairs with the HiByMusic app for remote control, which is worth installing rather than relying purely on the dongle’s lack of physical buttons. Through the app you get a live readout of data rate and audio format, battery status, EQ adjustment, and even voice control for basic playback commands. It is a genuinely useful companion given how minimalist the hardware itself is, and it turns what could have been a fiddly, button-free device into something easy to manage entirely from your phone.
It is worth noting HiBy also makes the W4, a different clip-on Bluetooth product with its own screen and a more involved USB-based firmware update process. The two are related in category but built for different use cases, so do not assume specs or update procedures carry over between them.
Where the W5 lands
A few months in, the W5 has earned a permanent spot on my IEM cable for commuting and gym use specifically because the cradle-based charging approach means I almost never think about battery anxiety. It is not the most powerful dongle on the market at 80mW per channel, and IPX67 resistance does not mean fully submersible, but for a $109 wireless clip-on with a legitimately clever charging solution and UAT support for higher-resolution playback, it fills a specific niche well. Additional independent measurements from the Audio Science Review forum generally back up HiBy’s published THD+N and SNR figures.
Troubleshooting the W5’s Most Common Issues
- Problem: The W5 won’t pair with a phone – forget the device in your phone’s Bluetooth settings and re-pair from scratch, making sure your phone’s software is up to date.
- Problem: UAT mode never activates – confirm your source device or app explicitly supports HiBy’s UAT protocol; otherwise the W5 correctly falls back to standard Bluetooth with LDAC.
- Problem: Battery drains faster than expected – the 150mAh internal cell is designed for short listening blocks between cradle top-ups, not all-day use without recharging.
- Problem: The charging cradle doesn’t top up the W5 – check that the pogo-pin contacts on both the dongle and cradle are clean and that the W5 is seated fully.
- Problem: Audio cuts out intermittently – move your phone closer, since Bluetooth range and reliability degrade through obstacles or when the phone is buried in a bag or pocket.
- Problem: The HiByMusic app shows the wrong format or data rate – close and restart the app, then reconnect to refresh the readout.
Frequently asked questions
Do I need a UAT-compatible source to use the W5?
No, the W5 works over standard Bluetooth 5.0 with LDAC support if your source is not UAT-compatible; you simply will not get the higher 192kHz/1.2Mbps ceiling that UAT enables.
How long does the charging cradle actually last before needing a wall charge?
The included 1000mAh cradle is rated to recharge the W5 roughly 5 times before the cradle itself needs topping up, extending total usable playback to around 20 hours between wall charges.
Is the W5 the same as the W4?
No, they are related but distinct products; the W4 has its own screen and a separate USB DFU-based firmware update process, while the W5 is a simpler, button-free clip-on receiver controlled through the HiByMusic app.
Is IPX67 resistance enough for the gym or rain?
IPX67 covers dust and temporary water immersion, so sweat and light rain are not a concern, though it is not designed for swimming or prolonged submersion.
Small wireless dongles like this one are easy to dismiss until you actually live with the charging logic day to day, and the W5’s cradle-based approach is the detail that ended up winning me over.
If you already own a wired dongle DAC and are debating whether to add a wireless clip-on to the mix rather than replace anything, the W5 makes that case reasonably well. It is not trying to out-power a wired setup, and it is not pretending IPX67 makes it indestructible, but as a lightweight, cradle-charged companion for days when a cable feels like one thing too many, it has quietly become one of the pieces of gear I reach for without thinking twice.
Small Bluetooth accessories like this rarely get the same attention as full-size DAPs on this site, but they earn their keep in exactly the everyday moments covered here, which is why I keep coming back to test them properly instead of skimming a spec sheet.