We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-02 · 6 min read · Independent comparison
If you want a rugged hard-shell case that keeps a Shokz OpenFit 2+ charging case locked shut and shielded from splashes, choose PROfezzion Shokz OpenFit 2+; if you need actual bone conduction headphones that play music for up to 10 hours while keeping your ears open to traffic, choose Fenpos Bone Conduction Headphones.
• PROfezzion Shokz OpenFit 2+ — biggest strength: a drop-proof hard shell with a secure locking latch and a non-slip silicone pad that grips the charging case without adhesive tape.
• PROfezzion Shokz OpenFit 2+ — biggest trade-off: it is a protector, not a listening device, and it fits only the Shokz OpenFit 2+ (2025) — not the OpenFit Air (2024) or OpenFit 1 (2023).
• Fenpos Bone Conduction Headphones — biggest strength: a complete open-ear Bluetooth headphone with bone conduction drivers, dual noise-reduction mics and up to 10 hours of battery life.
• Fenpos Bone Conduction Headphones — biggest trade-off: open-ear bone conduction means you trade total isolation for situational awareness, and there is no wired fallback because there is no headphone jack.
• Pick PROfezzion if you already own (or are buying) Shokz OpenFit 2+ and want to protect the charging case; pick Fenpos if you need the headphones themselves.
Let's be clear about what this product is, because a lot of shoppers land on it expecting earbuds. The PROfezzion Shokz OpenFit 2+ is a case cover, not a headphone. It wraps around the Shokz OpenFit 2+ charging case and adds a layer of heavy-duty protection the bare case simply doesn't have. The shell is built from a mix of ABS, polycarbonate, metal, plastic and silicone, and the whole thing weighs about 0.08 kg — light enough that it doesn't turn a pocketable case into a brick. At roughly 3.01 x 2.81 x 1.33 inches, it's shaped around the OpenFit 2+ case specifically.
The features that actually matter day to day are the locking latch and the interior silicone pad. The latch holds the charging case shut, which addresses a very real annoyance: open-ear buds popping out when a case gets dropped or jostled in a bag. The silicone pad on the bottom grips the charging case firmly so it doesn't rattle around inside the shell, and — this is the detail I appreciate most — it doesn't rely on adhesive tape to stay put the way some covers do. Adhesive fails over time; a molded silicone grip doesn't. Add the IPX5 rating and you get protection against splashes and spills, plus dust resistance and shockproofing.
Who should buy it: anyone who owns the Shokz OpenFit 2+ (2025) and wants drop protection, a secure latch, and splash resistance for the charging case — especially people who carry their buds loose in a backpack or gym bag. Who should skip it: anyone with the OpenFit Air (2024) or OpenFit 1 (2023), because it will not fit those models, and anyone who actually needs headphones rather than a case. If that's you, keep reading.
The Fenpos X67 is a completely different kind of product: a full set of open-ear wireless headphones using true bone conduction drivers. They sit outside your ear canal and transmit sound through bone, which is exactly why they're a natural fit for running, cycling and commuting — you hear your music and the world around you at the same time. That situational awareness isn't a bonus feature here; it's the entire point of the design, and the spec sheet leans into it with an explicit open-ear form factor.
On the audio side, Fenpos lists SBC and AAC decoding support, stereo drivers, and a "heavy bass function," with the company describing the tuning as even across high and low frequencies and the sound quality as close to CD. I'd treat the marketing language with normal skepticism, but the codec support and driver type are concrete: this is a Bluetooth 5.4 headphone with a 10-meter wireless range. The dual noise-reduction setup with front and rear mics is aimed squarely at call quality — reducing ambient noise so you can take a call without your voice getting buried.
Battery life is rated at up to 10 hours, which is genuinely useful for all-day sport and commuting use, and it charges over Type-C. Controls are push-button, so there's no touch panel to misfire when your hands are sweaty. The IPX5 rating here means the same thing it means on the PROfezzion case: resistance to splashes, rain and sweat, not full submersion. And because there's no headphone jack, this is wireless-only — no cable fallback if the battery dies.
Who should buy it: runners, cyclists, walkers and commuters who want music with an ear open to traffic, plus anyone who sweats heavily and needs IPX5 sweat protection without sealed in-ear buds. Who should skip it: anyone who wants deep noise isolation for flights or loud offices — bone conduction deliberately lets the outside world in.
Side-by-Side: Which Should You Choose?
• Best for protecting a Shokz OpenFit 2+ charging case → PROfezzion Shokz OpenFit 2+ (hard shell, locking latch, non-slip grip).
• Best for actually listening to music → Fenpos Bone Conduction Headphones (bone conduction drivers, stereo audio, Bluetooth 5.4).
• Best for battery life → Fenpos (up to 10 hours, Type-C fast charging).
• Best for splash and sweat resistance → a tie on paper (both are rated IPX5), but only Fenpos wears that rating on the body you're exercising with.
• Best for situational awareness outdoors → Fenpos (open-ear bone conduction keeps you aware of your surroundings).
• Best fit for a specific, single model → PROfezzion (made only for the OpenFit 2+ 2025, so check your model before buying).
• Best for a small, light add-on → PROfezzion (0.08 kg, roughly 3 x 2.8 x 1.3 inches).
These two don't really compete — they solve different problems, and the honest answer is that many OpenFit 2+ owners could reasonably want both. But if you're forcing me to pick one, I'd buy the Fenpos Bone Conduction Headphones, because they deliver the thing most people are actually shopping for: sound, calls, sweat resistance and 10 hours of battery in one open-ear package. I'd only steer you to the PROfezzion case if you already have your headphones sorted and your real concern is a cracked or popped-open charging case. Before either purchase, check the current price on Amazon using the button on this page — that's the one number I won't guess at.
are headphones waterproof
Neither of these is fully waterproof. The Fenpos Bone Conduction Headphones are rated IPX5, which means they resist splashes, rain and sweat but are not designed to be submerged. The PROfezzion case cover carries the same IPX5 rating for splash and spill protection. In short: fine for workouts and weather, not for swimming.
are headphones water resistant
Yes — in this matchup, both are water resistant to the IPX5 level, and IPX5 is specifically about protection from water jets and splashes. For the Fenpos headphones, that covers sweat and rain during runs and commutes. For the PROfezzion shell, it covers spills and splashes reaching the charging case inside. Neither rating promises you can dunk them.
No. They're unrelated products. The PROfezzion Shokz OpenFit 2+ case cover is built only for the Shokz OpenFit 2+ (2025) charging case and won't fit other earbuds or cases. The Fenpos X67 is a standalone pair of Bluetooth bone conduction headphones with its own charging setup over Type-C. Buying one doesn't require or include the other.
Only if you have the Shokz OpenFit 2+ (2025). PROfezzion states clearly that it is not compatible with the OpenFit Air (2024) or the OpenFit 1 (2023), and the case is listed in an OpenFit 2+ (2 Plus) version specifically. Check your exact model name before ordering — the fit depends on it.
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