White stem earbuds with a half in-ear shape, soft caps in three sizes and a case that keeps them going for up to 50 hours.
The XIAOWTEK A40 Pro takes the white stem look everyone knows and tilts it. Each bud is angled at 108 degrees in a half in-ear shape, so the sound outlet points toward the ear canal while the body rests in the outer ear. It is a middle path between a loose open stem and a fully sealed tip.
That middle path comes with a few pleasant details:
Because the A40 Pro does not plug the canal completely, you still hear what is going on around you, only softer than with a pure open stem. That makes it a good pick for walks, office days and chores where you want music without feeling shut off. The caps help it stay put when you move more than a classic stem would.
XIAOWTEK tunes the 12mm drivers for strong bass, clear mids and bright treble. A half in-ear shell lets a little low end escape compared with a full seal, so podcasts, pop and background music at work suit it best. If thumping bass is the goal, a fully tipped pair gives more.
The finish is glossy white from stem to case, the classic look that pairs well with any phone.
| Spec | Value |
|---|---|
| Model | XIAOWTEK A40 Pro |
| Fit | Half in-ear stem, 108° angle |
| Ear caps | Silicone, S/M/L sizes included |
| Bluetooth | 5.3 |
| Wireless range | Up to 10m (33ft) |
| Bluetooth profiles | HSP, HFP, A2DP, AVRCP |
| Driver | 12mm dynamic |
| Frequency range | 20Hz–20kHz |
| Microphone | Built in, call noise reduction |
| Controls | Touch |
| Total with case | Up to 50 hours |
| Case charging | USB-C, about 1.5 hours |
| Water rating | IPX7 |
| Bud weight | 0.14oz (about 4g) each |
| Listening modes | Stereo or either bud alone |
| Pairing | Hall switch: powers on and reconnects when the lid opens |
| Works with | iPhone, Android, Windows PCs, tablets |
| In the box | 2 earbuds, charging case, S/M/L ear caps, ear cushions, USB-C cable, manual |
| Warranty | 1 year |
| Color | White |
The A40 Pro case holds enough charge for up to 50 hours of listening in total. That is among the longer totals for a plain-case pair, and it means most people charge the case once every week or two. The case refills over USB-C in about an hour and a half.
The A40 Pro also has a friendly trick for long days: either bud can work alone. There is no master side, so you can wear the left bud while the right one charges, then swap. XIAOWTEK calls this single and binaural mode.
| Item | A40 Pro |
|---|---|
| Total with case | Up to 50 hours |
| Case recharge | About 1.5 hours over USB-C |
| Solo bud | Left or right |
| Case display | None, plain case |
The case is plain, so you judge its charge by the light rather than by digits. A simple habit avoids surprises: plug it in every Sunday evening, whatever the light says.
Battery figures are always best-case. Loud volume and lots of calls shorten each session. For what the case lights usually mean and how to wake a flat bud, see the charging guide.
Keep the charging pins inside the case clean as well. A little pocket lint on them is enough to stop a bud from topping up.
A hall switch in the case does the work of a power button. It senses the lid opening, wakes the buds and reconnects them to the last device they used. After the first pairing, you open the case, put the buds in your ears and press play.
The A40 Pro speaks the standard Bluetooth profiles, HSP and HFP for calls plus A2DP and AVRCP for music and track control. Put simply, iPhones, Android handsets, Windows PCs and tablets all connect without any app. Step-by-step help for each device lives in the pairing guide.
Once connected, the touch pads handle the everyday jobs:
Exact tap counts are listed in the A40 Pro manual, and the touch controls guide explains the common patterns stem pairs use. Tap lightly with a fingertip; pressing hard only pushes the bud deeper.
If only one side plays after a while, put both buds in the case, shut the lid briefly and lift them out together. When that does not help, forget the A40 Pro on your phone and pair again from the start.
Moving the A40 Pro to a second device is easy too. Switch off Bluetooth on the first phone, open the lid near the new device and pick the A40 Pro from its list. Disconnecting the first device before you switch keeps the buds from jumping back to it.
The A40 Pro competes with a crowd of white stem pairs, and its mix is unusual. It pairs a long 50-hour total and IPX7 with that half in-ear shape and a set of caps. Rivals tend to go either fully open or fully tipped, and many of them add a battery display.
| A40 Pro | Jxrev J51 | KTGEE T08 | |
|---|---|---|---|
| Fit | Half in-ear, caps | Open fit | Open fit |
| Driver | 12mm | 13mm | 13.2mm |
| With case | Up to 50h | Up to 36h | Up to 40h |
| Case display | No | No | LED digits |
| Water | IPX7 | IPX7 | IPX7 |
The A40 Pro makes sense if:
Consider the Jxrev J51 for the lightest possible bud, or the KTGEE T08 if you want to read the battery in digits. For a sealed fit with a display from the same maker, the XIAOWTEK A66 is the natural step up.
Before ordering, check two things. The A40 Pro runs Bluetooth 5.3, not 5.4, which matters little with a phone but is worth knowing if you compare boxes. And it comes in white only, so plan on a case cover if you would rather hide scuffs.
Warranty is a quiet plus. XIAOWTEK covers the A40 Pro for a full year, while some budget stems come with only 90 days. Keep the box and the order details handy in case a bud ever stops charging.
It is a half in-ear design: the bud rests in the outer ear at a 108-degree angle, and three sizes of silicone caps let you make the hold snugger.
Yes. There is no master bud, so the left or right bud works on its own for calls or music.
Up to 50 hours in total with the charging case. The case recharges over USB-C in about 1.5 hours.
The buds are rated IPX7, so sweat, rain and splashes are fine. Keep them out of the pool and dry them before charging.
Yes. It uses standard Bluetooth profiles for music and calls, so Windows PCs, Macs, iPhones and Android phones all pair with it.