How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-08 · 7 min read · Independent comparison
• SYSFUN Single — best for sleep, work and one-ear listening; pick this if a 3.3 g almost-invisible bud with 12 hours of playback per charge matters more to you than stereo sound or water resistance.
• SYSFUN Single — best for the same discreet single-ear role in a lighter color; pick this if you want the newer Bluetooth 5 connection and don't need sound isolation.
• JVC True — best for all-day desk and commute listening; pick this if you want a charging case that pushes total playtime to 22 hours and IPX4 splash protection.
• JVC Sport True — best for hard training sessions; pick this if you want the longest total battery here, an ear hook that stays put, and IPX5 water resistance.
This is a mono earbud, and that single fact drives everything about it. You get one X7 unit, a charging cable and spare ear cushions — no case, no wall adapter. At 3.3 g with a rounded in-ear tip, it's designed to disappear into the ear canal. The published fit guidance is unusually honest: insert, then rotate gently forward until it locks in. Do that and it stays put through walking, jogging, hiking, biking and gym work, which is exactly the list the specs point at.
The 12-hour battery figure is the headline for a bud this small, and it's per charge rather than with a case, since there isn't one. Recharge takes about 2.5 hours, and the manufacturer is specific about how: a standard 5V/1A USB-A port. High-power PD chargers above 15W are explicitly not recommended because of heat and long-term battery wear. If you own one of those compact USB-C bricks with fast-charge output, this is a genuine gotcha — you'll want a plain port instead. There's no USB-C charging here either, so if USB-C is a hard requirement for you, this isn't the one.
Sound is the trade-off you accept. The spec sheet says it plainly: not comparable to high-end headphones, but clean and pleasant for music, audiobooks and podcasts, with a built-in mic for calls. With 32-ohm impedance and a 20Hz–20,000Hz dynamic driver, it's tuned to be easy to drive, and spoken content is where it does its best work. Bluetooth 4 with a 10-meter range is dated, and there's no water-resistance rating, so sweat-heavy sessions are a risk. Small ear canals are also called out — narrow ears may find prolonged wear uncomfortable. My take: this is a sleep, work and podcast bud, not a gym hero.
Same X7 hardware, same 3.3 g weight, same 12-hour battery and the same 2.5-hour charge window — but this version is Beige and runs Bluetooth 5 instead of 4, which is the meaningful difference between the two listings. Newer Bluetooth generally means a more stable connection and better power behaviour, and that's a real quality-of-life upgrade for a bud you'll re-pair between a phone and a laptop.
The rest of the story is identical, so the same caveats apply. One earbud only; buy two and follow the stated pairing sequence if you want stereo. No charging case. No water-resistance rating. Sound isolation is listed as the noise-control approach, and the fit guidance about rotating the bud forward still matters — a loose fit hurts both comfort and audio. Charge it from a plain 5V/1A port and keep fast chargers away.
Who is this for? Someone who wants an almost invisible earbud for one-ear listening — calls while working, podcasts on a walk, ambient audio at night. The beige finish is less conspicuous against skin than black if discretion is the whole point. The trade-offs are unchanged and worth repeating: no sweat rating, Bluetooth range capped at 10 meters, and a firm warning that very small ear canals may not suit it at all.
The HAA3TB is the conventional true-wireless pick here, and its numbers are straightforward. Total battery is rated up to 22 hours with the included charging case, Bluetooth is 5.1, and the drivers are 11mm neodymium dynamic units at 16 ohms covering 20Hz–20,000Hz. In practice that means a bigger, fuller presentation than a micro-bud can manage, with enough efficiency that your phone isn't straining to drive them.
IPX4 is the durability story: resistance to water splashing from any direction. That's rain, sweat spray and splashes at the sink — not submersion. For gym sessions and outdoor runs in bad weather it's a sensible floor; for swimming or heavy downpours it isn't. Touch controls handle volume and playback remotely, and voice assistant support is included, which is handy mid-workout when you don't want to dig out a phone.
The fit note is the one thing I'd flag hardest: JVC states this earbud is designed for adult ears. If you're buying for a teenager, that's worth knowing before you commit. The ABS build keeps it light, and the rounded-tip in-ear shape with sound isolation is standard for the category. My opinion: this is the best of the four for long desk days, commutes and mixed indoor use where you want isolation and a case to top up from — but for genuinely punishing exercise, the next one is the better fit.
This is my pick for exercise, and the specs back it up. Battery is rated up to 30 hours total with the built-in battery and included charging case — the longest figure of the four. The shape is an ear hook in soft silicone, which is the design detail that matters most when you're moving: a hook anchors against the outer ear rather than relying purely on canal pressure, so it resists the bounce that shakes loose buds out mid-run.
IPX5 is a step up from IPX4 — protection against water projected from a nozzle, which maps well to sustained sweat and rain. Three sound modes let you switch between normal, bass and clear tuning, so you can push low end for training playlists or clarity for spoken cues. Touch controls and voice assistant support are both there, Bluetooth is 5.1 with a 10-meter range, and the drivers are 16-ohm neodymium dynamic units spanning 20Hz–20,000Hz.
Then there's the feature that makes this genuinely interesting: an included open-type piece that lets surrounding sound in. That's the open-ear configuration people search for when they want situational awareness — hearing traffic, a training partner or gym announcements while still listening. It's not a dedicated hi-res open-ear model, so don't expect that class of audio, but for outdoor exercise the safety benefit is real. Trade-off: no active noise cancellation, the theme here is sport rather than isolation, and the hook fit won't suit everyone.
How We Picked
FAQ
The SYSFUN X7 is rated at 12 hours per charge with a 2.5-hour recharge. The JVC HAA3TB is rated up to 22 hours total with its case, and the JVC HAEC25TA up to 30 hours total with its case. Total figures include top-ups from the charging case, not a single uninterrupted session.
No. The manufacturer specifically warns against PD or any fast charger over 15W, citing overheating and shortened battery lifespan. Use a standard 5V/1A USB-A port — a computer or a basic wall adapter.
The JVC HAEC25TA, in my opinion. It carries an IPX5 rating against projected water, has an ear hook for a stable fit, and offers the longest total battery. The JVC HAA3TB is rated IPX4 for splashes. Neither SYSFUN model lists a water-resistance rating.
Yes — the JVC HAEC25TA includes an open-type piece so you can hear what's around you, which is useful for outdoor exercise. The other three are in-ear designs; the SYSFUN models use sound isolation and the JVC HAA3TB is listed with sound isolation as well.
If your priority is exercise, I'd go with the JVC Sport True HAEC25TA: the ear hook, IPX5 rating, open-type option and 30-hour total battery make it the most sensible match for training. If you'd rather have a discreet single bud for sleep, calls and podcasts, the SYSFUN X7 is the better fit — just keep it away from fast chargers and heavy sweat.
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