How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want a more adjustable, secure fit with a lidless case that's faster to grab on the go, choose Anker Soundcore V40i; if you need longer battery life, stronger water protection and hi-res codec support for workouts and all-day wear, choose EarFun OpenJump Open Ear.
• Anker Soundcore V40i — biggest strength: 4-level adjustable ear hooks that tailor the fit and pull the driver closer to the ear canal for more bass, plus a clever lidless magnetic case.
• Anker Soundcore V40i — biggest trade-off: 6 hours per charge (21 hours with the case) and IP55, which is splash-resistant but not built for heavy sweat or rain.
• EarFun OpenJump Open Ear — biggest strength: 11 hours per charge, 42 hours total, IPX7 waterproofing and LDAC/Hi-Res support in a very light earbud.
• EarFun OpenJump Open Ear — biggest trade-off: the ear hooks are adjustable but not multi-level tuned the way the V40i's are, so fit is less customizable.
• Who each pick is for: the V40i suits people who care most about fit and bass; the OpenJump suits runners, gym-goers and anyone who hates charging.
The V40i's headline feature is its fit system. Anker gives you 4 adjustable positions on the ear hooks, and the company says that covers over 99% of ear shapes and sizes. That matters more than it sounds. Open-ear buds live or die on whether they sit close enough to your ear canal, and an adjustable hook lets you dial that in yourself instead of hoping the default shape works.
Anker also ties the fit directly to sound. By bringing the driver closer, the hooks add up to 7.5dB of bass compared with non-adjustable hooks (Anker's own lab figure). Add 16 × 13mm drivers, a high-elastic diaphragm and an hourglass-shaped chamber, and the pitch is punchy bass and loud volume even in noisy places. On calls you get 4 mics with AI noise filtering, and Bluetooth 5.4 handles the wireless side with a 10-meter range.
The other distinctive piece is the case. It's lidless, held shut by 10 magnets, with a light bar to show status. You pop the buds in and out without flipping anything open — genuinely handy if you're grabbing them one-handed. The trade-off is battery: 6 hours on the buds, 21 with the case, and a 2.5-hour charge. IP55 covers splashes and light sweat, not swimming or a downpour.
Buy the V40i if you've struggled to get open-ear buds to fit, you want fuller bass from an open design, and you like the quick-access case. Skip it if you train hard in the rain, run long sessions, or want the longest possible battery between charges.
EarFun takes the opposite approach: less fine-tuning, more endurance. The OpenJump gives you 11 hours on a single charge and 42 hours with the case — roughly double the V40i's per-charge figure. A 10-minute top-up buys 2 hours of playback, which is the kind of thing that saves you on the way out the door.
It's also the tougher of the two. IPX7 waterproofing plus EarFun's SweatShield treatment means sweat, rain and splashes are squarely in scope, and each earbud weighs just 0.28oz. For running, gym sessions or hot-weather commuting, that combination is the whole point.
On sound, EarFun leans on a 14.2mm wool composite driver, BassSurge tuning and LDAC with Hi-Res audio support — LDAC being the codec that lets compatible Android phones send more data over Bluetooth. You also get multipoint pairing to two devices at once and Google Fast Pair for quick Android setup over Bluetooth 5.3. Calls run through 4 beamforming mics with AI noise reduction, same mic count as the V40i.
The fit is a double-curved surface with soft, adjustable ear hooks — secure and snug, but without the V40i's stepped adjustment levels. If your ears are unusual, the V40i gives you more knobs to turn. Buy the OpenJump if you're a runner or gym regular, you want the longest battery, or you want LDAC and multipoint. Skip it if fit customization is your top priority.
Side-by-Side: Which Should You Choose?
• Best for battery life → EarFun OpenJump Open Ear (11 hours per charge, 42 with the case, versus 6 and 21).
• Best for fit customization → Anker Soundcore V40i (4 adjustable hook positions covering over 99% of ear shapes, per Anker).
• Best for heavy sweat and rain → EarFun OpenJump Open Ear (IPX7 and SweatShield versus IP55).
• Best for hi-res audio listeners → EarFun OpenJump Open Ear (LDAC and Hi-Res support; the V40i lists Bluetooth 5.4 but no hi-res codec).
• Best for multi-device switching → EarFun OpenJump Open Ear (multipoint pairing to two devices at once; the V40i doesn't list multipoint).
• Best for quick access and a compact case → Anker Soundcore V40i (lidless magnetic case with a status light).
• Best for featherweight wear → EarFun OpenJump Open Ear (0.28oz per earbud, though the V40i's total kit is lighter at 69g versus 72.4g).
If I'm buying one, I'd take the EarFun OpenJump Open Ear. In my opinion, the combination of 42 hours of total playtime, IPX7 waterproofing and LDAC support is the more useful package for the way most people actually use open-ear headphones — outdoors, moving, sweating, and forgetting to charge. The V40i's adjustable fit and bass boost are real advantages, and I'd steer anyone with hard-to-fit ears toward it. But for the broadest everyday and workout use, the OpenJump wins on stamina and durability.
how to open ear headphones work
Open-ear headphones rest outside your ear canal rather than sealing inside it, and both of these use an ear-hook shape to hold the driver in place. The driver fires toward your ear while leaving the canal open, so you hear your music and your surroundings at the same time — which is exactly why they're popular for running and cycling.
how to wear open ear headphones
how to use open ear headphones
Pair them over Bluetooth — the V40i uses Bluetooth 5.4, the OpenJump uses Bluetooth 5.3 with Google Fast Pair for Android — then use the touch controls on the earbuds for playback and calls. Both charge in their cases: the V40i gives 6 hours per charge and 21 with the case, while the OpenJump gives 11 and 42.
Anker Soundcore V40i vs EarFun OpenJump Open Ear — which has better battery life?
The EarFun OpenJump Open Ear, clearly: 11 hours per charge and 42 hours with the case, against 6 and 21 for the Anker Soundcore V40i. If you'd rather not think about charging, that gap is the deciding factor — and the OpenJump's 10-minute quick charge adds 2 hours of playback.
As an Amazon Associate I earn from qualifying purchases.
We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon and affiliated sites.
When you buy through links on this page, we may earn a commission from qualifying purchases at no extra cost to you.
Amazon and the Amazon logo are trademarks of Amazon or its affiliates. This site is an independent third-party review and is not affiliated with, endorsed by, or sponsored by Amazon or the product brands mentioned.
See also: Purity Air Open Ear vs Anker Soundcore P30i, EarFun Clip Open Ear vs MOCANIO Open Ear Clip, FiiO /Snowsky Retro Nano vs Anker Soundcore Liberty 5