We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-22 · 7 min read · Independent comparison
If you want marathon battery life, a charging case that doubles as a phone power bank, and a secure in-ear fit for sweaty gym sessions, choose hadbleng Earbuds Sport 128H; if you need to keep your ears open to traffic and surroundings while running or cycling, choose Rakklor Bone Conduction Headphones. These two solve different problems, and picking the wrong one means fighting its design every single workout.
• hadbleng's biggest strength: a 2600 mAh charging case that pushes total playtime to a claimed 128 hours and can top up your phone in a pinch.
• hadbleng's biggest trade-off: it still seals your ear canal, so you lose awareness of traffic and surroundings.
• Rakklor's biggest strength: open-ear bone conduction design that leaves your ears completely unblocked for safer outdoor sessions.
• Rakklor's biggest trade-off: 20 hours per charge with no charging case, and the open design trades bass depth for awareness.
• Pick hadbleng if you train indoors, want punchy bass, and hate charging cables.
• Pick Rakklor if you run or ride near traffic and want to hear what's coming.
The hadbleng Earbuds Sport 128H (model Q22) is built around one idea: never think about charging. The earbuds themselves deliver 8 hours per charge, and the 2600 mAh case extends that to a claimed 120 hours of music playback, with a 128-hour figure tied to the case battery. A dual LED display on the case shows both the remaining case power and each earbud's charging status, so you always know where you stand before a session. That matters more than it sounds. Most earbuds die silently mid-run because you had no idea the case was nearly empty.
The audio side is aimed at people who want thump. The 13 mm dual-layer graphene diaphragm drivers pair with a bass enhancement algorithm and Hi-Fi tuning, and the frequency range covers the standard 20 Hz to 20,000 Hz span. There's also hybrid ENC noise cancellation on the mic side, which the spec sheet says passively cuts around 90% of background noise — useful for calls from a noisy gym floor or a windy street. Bluetooth 5.3 handles the connection with a 15-meter range and one-step auto-pairing once you've connected the first time.
Physically, these are over-ear hook style earbuds weighing about 6 grams each, with flexible earhooks and three sizes of silicone tips in the box. The IP7 waterproof rating covers splashes, rain and heavy sweat. Touch controls handle track skipping, volume, calls and a voice assistant without pulling out your phone. There's even a genuinely clever extra: the case can charge your phone by more than 30% when fully charged, which is real insurance on a long day out.
Who should buy it: gym regulars, treadmill runners, commuters and anyone who wants deep bass, long stretches between charges, and a case that can bail out a dying phone.
Who should skip it: cyclists and road runners who need to hear traffic. The in-ear, ear-canal-sealing design works against that. Also skip it if you dislike the feeling of tips inside your ears for hours.
The Rakklor Bone Conduction Headphones (model M2) take the opposite approach. Instead of pushing sound into your ear canal, a bone conduction driver vibrates against your cheekbone and transmits audio that way, leaving your ears fully open. The practical payoff is situational awareness: you hear cars, other cyclists, voices and your surroundings while music or a podcast plays. If you've ever been startled by a car you never heard coming, you understand why this design exists.
The spec sheet lists a 20-hour continuous playtime per charge, with a 2-hour full charge time. There's also a quick-charge claim: a 10-minute USB-C top-up gives up to 90 minutes of playback. That's the kind of number that saves you when you remember your headphones are dead ten minutes before a run. Bluetooth 5.4 handles the connection with a 10-meter range, and the built-in mic plus on-unit button controls let you manage volume, tracks and hands-free calls without touching your phone.
Weight is the other headline: 25.5 grams total. The flexible neckband and ergonomic ear-hook design keep it stable during movement, and because nothing sits inside your ear, there's no in-ear pressure or ear fatigue over long sessions. The box includes silicone earplugs, which you can wear to add bass or block noise when you're somewhere safe and want more isolation — a nice flexibility that the open design alone doesn't give you.
The honest trade-offs: IPX5 covers sweat and light rain but explicitly not swimming or full immersion, so it's a step below the hadbleng's IP7. There's no charging case, so you're carrying the headphone and a cable. And open-ear audio simply doesn't deliver the same low-end punch as a sealed in-ear design — that's physics, not a flaw. The audio latency figure is listed at 60 milliseconds, which is fine for music and podcasts but worth knowing if you're sensitive to lip-sync on video.
Who should skip it: swimmers, anyone who wants maximum bass, and people who want the convenience of a charging case instead of remembering a cable.
Side-by-Side: Which Should You Choose?
• Best for battery life → hadbleng Earbuds Sport 128H. A claimed 128 hours with the case versus 20 hours per charge.
• Best for outdoor safety → Rakklor Bone Conduction Headphones. Open-ear design keeps traffic and surroundings audible.
• Best for bass and immersive sound → hadbleng Earbuds Sport 128H. 13 mm graphene drivers plus a bass enhancement algorithm.
• Best for all-day comfort without ear pressure → Rakklor Bone Conduction Headphones. 25.5 g total and nothing inside your ear canal.
• Best for heavy sweat and rain → hadbleng Earbuds Sport 128H. IP7 versus the Rakklor's IPX5 rating.
• Best for a quick top-up before you leave → Rakklor Bone Conduction Headphones. A 10-minute charge reportedly yields up to 90 minutes of playback.
• Best for charging your phone in an emergency → hadbleng Earbuds Sport 128H. The 2600 mAh case can add more than 30% to a phone battery.
• Best for gym and indoor training → hadbleng Earbuds Sport 128H. Secure earhooks and sealed audio suit loud, stationary environments.
• Best for cycling, running and hiking → Rakklor Bone Conduction Headphones. That's the exact use case the design was built around.
In my opinion, the right pick comes down to where you train. If your workouts happen indoors or on a treadmill and you want serious bass, marathon battery life and a case that can rescue your phone, I'd buy the hadbleng Earbuds Sport 128H — its 2600 mAh case and IP7 rating are hard to argue with for gym use. If you run or ride anywhere near traffic, I'd buy the Rakklor Bone Conduction Headphones instead, because staying aware of your surroundings is worth more than any bass boost. Safety first, sound second.
For outdoor running near traffic, yes — in my opinion. The open-ear design lets you hear cars and surroundings, and the 25.5 g weight keeps it stable. The hadbleng seals your ear canal, which sounds fuller but blocks awareness.
The hadbleng wins clearly. It claims up to 128 hours total with its 2600 mAh case, while the Rakklor offers 20 hours per charge and no case. The Rakklor does have a fast 10-minute top-up for 90 minutes of playback.
No. The hadbleng is rated IP7 for splashes, rain and sweat, but that's not a swimming rating. The Rakklor is IPX5 and explicitly not intended for swimming or full immersion either. For pool laps you'd want a dedicated swim model.
Go with the hadbleng Earbuds Sport 128H. Its 13 mm dual-layer graphene drivers and bass enhancement target exactly that, and the hybrid ENC mic setup is designed to cut background noise on calls. The Rakklor's open design trades bass depth for awareness.
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