How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want a lighter, more call-focused headphone with explicit dual-mic noise reduction and rock-solid Bluetooth 5.4, choose Fenpos Bone Conduction Headphones; if you need a cheaper-feeling, flexible titanium frame that survives being shoved in a gym bag, choose Gelecek Bone Conduction Headphones.
• Fenpos biggest strength: Two microphones (front and rear) with dual noise reduction, plus SBC/AAC decoding for cleaner music and calls.
• Fenpos biggest trade-off: Heavier at 26 g and only IPX5, so heavy sweat or rain exposure needs more care.
• Gelecek biggest strength: A titanium frame at 29 g that bends without deforming, with a claimed 50% reduction in sound leakage.
• Gelecek biggest trade-off: Spec sheet inconsistencies (marketing says IP55, product info says IPX5) and a slightly heavier build.
• Who Fenpos is for: Commuters, remote workers, and anyone who takes calls outdoors and wants the mic side handled properly.
• Who Gelecek is for: Gym-goers, runners, and hikers who want a flexible, durable frame they can toss around.
Fenpos builds its pitch around audio and voice, not just the open-ear concept. The X67 supports SBC and AAC decoding, which matters because those are the formats your phone actually streams over Bluetooth. The spec sheet calls the sound "close to CD" and describes even high and low frequencies with a heavy bass function — that's marketing language, but the codec support behind it is real and it's the part I'd weigh most. Dual noise reduction with a front and rear mic is the standout feature here. Most budget bone conduction sets have one mic and call quality suffers the moment there's wind or traffic. A rear mic changes that equation.
At 26 g with an open-ear shape and push-button controls, it's built for people who wear headphones for hours and don't want to think about them. Ten hours of battery on Type-C charging covers a full workday plus a commute. Bluetooth 5.4 and a 10-meter range are current-generation specs, so pairing is fast and stable. Siri activation on a single key is a small thing that becomes a big thing if you use voice assistants while cycling or walking.
Who should skip it? If you're a heavy sweater or you train in the rain, IPX5 is the floor, not the ceiling — it handles sweat and light rain but not submersion or sustained downpours. And if your priority is maximum flex in the frame rather than call clarity, the Gelecek is the more obvious pick. Check the current price on Amazon before deciding, since that gap shifts the math.
Gelecek's HS1 leads with the frame. Titanium, 29 g, and the claim that it withstands stretching and bending without deforming. That's the detail that tells you who this is for: people who treat gear badly. If your headphones live in a gym bag, get pulled on and off between sets, and occasionally get sat on, a flexible titanium frame is worth more than a marginally better codec.
The second real feature is the fully enclosed cavity design, which Gelecek says cuts sound leakage by up to 50%. Leakage is the classic complaint about bone conduction — everyone on the bus hears your podcast. A 50% reduction doesn't make it silent, but it's a meaningful design choice aimed at the exact annoyance buyers complain about. The Audi Cloudy Gray finish is also a bit less generic than plain black.
There's a spec conflict worth flagging honestly. The feature bullets say IP55, while the structured product information lists IPX5. Those aren't the same rating, and I can't resolve which one applies. Treat it as sweat-and-splash resistant at best, not something to swim in. Battery life is listed at 10 hours with Type-C fast charging, and Bluetooth 5.4 with a mic covers calls and video meetings.
Skip the Gelecek if clear phone calls in noisy places are your top priority — the noise-cancelling call claim is there, but there's no dual-mic setup described the way Fenpos describes one. Also skip it if you want color options beyond the single Audi Cloudy Gray.
• Best for call clarity → Fenpos Bone Conduction Headphones. Front and rear mics with dual noise reduction is the most concrete call-quality advantage in either spec sheet.
• Best for durability and flex → Gelecek Bone Conduction Headphones. The titanium frame is explicitly rated to bend and recover.
• Best for music format support → Fenpos Bone Conduction Headphones. SBC and AAC decoding are named; Gelecek's sheet doesn't specify codecs.
• Best for reducing sound leakage → Gelecek Bone Conduction Headphones. The enclosed cavity design targets leakage directly.
• Best for all-day office and commute wear → Fenpos Bone Conduction Headphones. 26 g, ten hours, Type-C, and one-key controls for play, calls, and Siri.
• Best for gym and trail abuse → Gelecek Bone Conduction Headphones. Flexible frame plus sweatproof construction built around sport use.
• Best if you want the safest waterproofing claim → Fenpos Bone Conduction Headphones. A clean IPX5 with no conflicting numbers in the data sheet.
• Best if you want a non-black look → Gelecek Bone Conduction Headphones. Audi Cloudy Gray is the only color either brand offers outside black.
I'd buy the Fenpos Bone Conduction Headphones. In my opinion, the dual front-and-rear mic array plus named SBC/AAC support is the more useful combination for most people, because most of us use these on commutes and calls, not just in the gym. The 26 g weight and one-key Siri access make it the easier all-day wear. The Gelecek wins on frame durability and leakage control, and if you're a runner who destroys gear, that's a legitimate reason to go the other way. For everyone else, Fenpos is the pick I'd stand behind.
FAQ
Yes. Both list a 10-hour average battery life with Type-C fast charging, so battery isn't the deciding factor between them.
Fenpos is the stronger spec on paper. It describes dual noise reduction with separate front and rear microphones, while Gelecek lists a general noise-cancelling call feature without that two-mic detail.
The data sheet says both, which is a real inconsistency. The feature bullets claim IP55; the structured product information says IPX5. Plan for sweat and light rain resistance either way.
Fenpos is lighter at 26 g versus the Gelecek's 29 g. The Gelecek offsets that with a titanium frame that's rated to flex without deforming.
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