These work reasonably well with good sound quality, especially at their $7 price point, but they have a few weird oddities.
Most significantly, the earpieces are absolutely symmetrical with no markings to distinguish left and right, and the only way I could tell was to connect them to a device and use a test app to put sound into each channel separately. If you insert them backwards into the charging case, the "L" and "R" indicators on the case (not the earpieces) light up with no indication they are backwards. As long as you put the earpieces into the case correctly once you figure out which way they should go, then you can use them without confusion.
Paired with an Ubuntu Linux laptop they negotiate A2DP and do not reliably switch into HFP, which means they are difficult to use for inbound audio (that is, as a microphone during telephone calls or video conferences) although they do seem to switch after repeated attempts. This is usually only a problem with older Bluetooth, but these claim to be 5.3.
Each earpiece has a button that clicks to use, which makes me highly skeptical that they meet IPX7 waterproofing as claimed, although I made no effort to test this. In my experience, IPX7 earpieces are solid without moving parts.
The instruction manual is terrible even by the usual standards for low-price electronics from Asia, containing purported words such as "unpuones" and incomprehensible frequently asked questions such as "Q. Howx:-49.66m one earphone has sound? Y:118.26m" and utterly puzzling "Q. How can I listen to music/talk without sound?" (Spoiler: I'm pretty sure you need sound to listen to anything.)
It is worth noting that the instruction manual states the run time as 5 hours, contrary to the web listing claiming 120 hours, and states that the earpieces have 50mAh battery capacity and the case has 200mAh battery capacity: assuming that the 50mAh describes _each_ earpiece for a total of 100mAh, this implies that the case only has enough battery capacity for two additional charges.
The charging port is Micro-USB rather than the modern standard Type-C, and although there is an included cable this is an inconvenience.
I cannot escape the suspicion that paying $10 instead of $7 would get me a substantially better product.
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