Solix SL-510 wireless earbuds sound like a gimmick at first: roughly $10 earbuds with a solar charging case. That combination usually triggers low expectations, and it should. Cheap earbuds are often rough around the edges, and solar charging on tiny accessories can easily become decoration rather than utility. The interesting part is that the Solix idea appears to have at least one genuinely practical use.
The basic hardware is simple. The SL-510 are Bluetooth earbuds with touch controls, a charging case, ear tips, and a USB cable in the box. Continuous battery life is around five hours, while the manufacturer lists total battery life at 25 hours with the case. Those numbers are ordinary, but ordinary is acceptable at this price if the product avoids becoming instant e-waste.
The solar case is the feature that separates the earbuds from other bargain-bin audio products. It will not replace normal charging for everyone, and it should not be treated like magic. But a case that can slowly add charge when left in light gives the earbuds a better chance of being ready for podcasts, calls, commutes, backup listening, or travel emergencies. That is more useful than another cheap case with no distinguishing idea.
Notebookcheck found that buyers should not expect strong sound quality, especially bass, but that the earbuds work for podcasts and calls, with good voice intelligibility on the other end. For readers who care more about premium audio and battery polish, our Sony WH-1000XM6 coverage shows what the high-end travel headphone market looks like.
A Backup Earbud With A Real Hook
The best way to understand the SL-510 is not as a main pair of earbuds for music lovers. It is a backup pair for a bag, car, desk drawer, or travel pouch. At around $10, the value equation changes. The earbuds do not need to beat Sony, Apple, Bose, Nothing, or Sennheiser. They need to be comfortable enough, loud enough, and charged enough when a user needs quick audio.
That is where the solar case becomes useful. Many backup earbuds fail because they are dead when needed. A case that passively gains charge in light can reduce that problem, even if the charging speed is modest. The feature is not about endless playback. It is about keeping a low-cost accessory from being forgotten and useless.
There are obvious compromises. Sound quality is limited, bass is weak, and the packaging does not sound especially environmentally friendly despite the solar angle. Cheap touch controls can also be inconsistent if the tuning is poor. Buyers should not expect premium app support, advanced noise cancellation, multipoint finesse, or a refined transparency mode.
Still, not every gadget has to compete at the top of the market. Sometimes a cheap product is worth discussing because it tries a practical idea in a disposable category. If a solar case helps budget earbuds last longer between plug-ins, that is a small but meaningful improvement. It gives the product a reason to exist beyond low price alone.
The SL-510 should be judged with realistic expectations. It is not a hi-fi product, and it is not a serious sports earbud. It is a cheap, odd, useful backup audio gadget. In a world full of nearly identical wireless earbuds, that is enough to make the solar case worth paying attention to.
