How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want a no-nonsense replacement charging cable for your RR Sports AC889 bone conduction headphones, choose WUNIAK Charging Cable; if you need a full set of wireless sport earbuds for the gym, running and calls, choose OYIB Earbuds.
• WUNIAK Charging Cable — biggest strength: a magnetic USB cable built specifically for the RR Sports AC889, with a built-in PTC voltage regulator to guard against overcurrent. Sold as a 2-pack.
• WUNIAK Charging Cable — biggest trade-off: it only charges. No audio, no Bluetooth, and it fits one headphone model — nothing else.
• OYIB Earbuds — biggest strength: Bluetooth 5.4 with 0.1s low latency, 50 hours of total playtime, IPX7 waterproofing and four ENC microphones for calls.
• OYIB Earbuds — biggest trade-off: they're a full audio purchase with a charging case to manage, and the battery figures assume you top up the case — not a simple one-cable fix.
• Who each is for: WUNIAK is for someone who already owns AC889 headphones and lost or damaged the original charger. OYIB is for someone who wants new wireless earbuds for workouts and calls.
This is an accessory, not a gadget, and it's honest about that. The WUNIAK cable is a 60cm magnetic USB charging cord made for the RR Sports AC889 bone conduction swimming headphones. The connector is magnetic and male-to-male with four pins, and the other end is a standard USB plug, so it draws power from a PC, laptop or wall adapter. One end snaps onto the headphones; the other goes into whatever USB source you have nearby.
What it does best is solve one specific, annoying problem: a lost or frayed original charger. WUNIAK built it as a direct replacement, so the fit is matched to the AC889 rather than being a generic cable that half-works. The interesting detail is inside — a PTC voltage regulator that limits overcurrent. That matters more than it sounds. Cheap charging cables can push unstable current into small Bluetooth batteries, and the PTC is there to stop that and protect the headphone. For a swimming-focused pair of bone conduction headphones that lives in a gym bag, that protection is the whole point.
Who should buy it: anyone who owns the RR Sports AC889 and needs a spare or replacement. The 2-pack is genuinely useful here — keep one at home, one in the car or bag. The 60cm length is short enough to coil into a pocket without tangling, and it's rated for indoor and outdoor use, so a wet poolside bag isn't a problem.
Who should skip it: anyone who doesn't own AC889 headphones. This cable is model-specific — the magnetic connector and 4-pin layout are matched to that headphone, so it won't help with earbuds, phones or other brands. If you're shopping for new audio gear rather than a cable, this isn't your product. It also only charges — there's no audio path here at all.
The OYIB S75 is a different category entirely: a pair of true wireless in-ear sport earbuds with silicone ear hooks, in white. The headline spec is Bluetooth 5.4 with Flash Pairing — open the case and they connect automatically after the first pairing, with 0.1s latency and a claimed 60% more stable signal than Bluetooth 5.3. For workout audio that matters, because dropouts mid-run are the thing that ruins wireless earbuds.
Battery is the other big draw. You get 8–10 hours per charge from the buds themselves, plus roughly 40 more hours in the charging case, for about 50 hours total. The case has a dual LED display showing both the case percentage and the individual earbud level, so you know exactly where you stand before a long flight or a full workday. Charging is over USB-C.
Sound and calls come from 13mm graphene dynamic drivers with a three-layer composite diaphragm, tuned for deeper bass, plus four ENC microphones that cut around 80% of background noise. ENC is call-side noise cancellation, not music ANC, and OYIB lists active noise cancellation among the controls — worth knowing that the call clarity claim is the more concrete one. The fit is the sport-specific part: soft silicone ear hooks spread the weight around your ear for a "zero-gravity" feel, and you get three ear tip sizes (S, M, L). IPX7 waterproofing covers heavy sweat and rain.
Who should buy it: runners, gym-goers, cyclists and HIIT people who need buds that stay locked in, plus anyone taking a lot of Zoom, Teams or Meet calls who wants a mic that fights background noise. Touch controls handle play, volume, tracks, calls and Siri or Google Assistant, and they pair with iOS, Android and Windows.
Side-by-Side: Which Should You Choose?
• Best for replacing a lost charger → WUNIAK Charging Cable. It exists for exactly one job.
• Best for battery life → OYIB Earbuds. 8–10 hours per charge and roughly 50 hours total with the case.
• Best for charging safety → WUNIAK Charging Cable. The built-in PTC voltage regulator is a deliberate overcurrent safeguard.
• Best for workouts → OYIB Earbuds. Ear hooks, three ear tip sizes and IPX7 sweat and rain resistance.
• Best for calls and meetings → OYIB Earbuds. Four ENC mics aimed at cutting background noise.
• Best for travel and bag space → WUNIAK Charging Cable. A 60cm cord versus a case plus two buds.
• Best for owning a spare → WUNIAK Charging Cable. It ships as a 2-pack, so you get a backup in the same box.
• Best for someone building an audio setup from scratch → OYIB Earbuds. Wireless, Bluetooth 5.4, touch controls, no cable needed.
In my opinion these two aren't really rivals — they solve opposite problems, and the right pick comes down to what you already own. If you have RR Sports AC889 headphones and your charger is dead or missing, I'd buy the WUNIAK cable without overthinking it: matched fit, overcurrent protection, two of them. If you're actually shopping for earbuds to wear running or on calls, I'd buy the OYIB S75 instead — the battery, IPX7 rating and ENC mics cover far more of daily life. Buying the cable when you need earbuds is a waste, and vice versa.
No. It's built specifically for the RR Sports AC889 bone conduction headphones, with a magnetic 4-pin male-to-male connector. Don't expect it to charge other brands or earbuds.
That's the combined figure: 8–10 hours of listening per charge, plus about 40 hours from the charging case. Real-world numbers depend on volume and how often you use the mics.
Yes. They have four ENC microphones designed to block around 80% of background noise, and OYIB lists Zoom, Teams, Google Meet and regular calls as intended uses.
They're not comparable on value because they do different things — one is a charging accessory, the other a full audio product. Check the current price on Amazon for each and judge against what you actually need, rather than against each other.
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: Philips TAH4205 vs Acjohtin Open Ear Headphones, ZHENYEMEI Sleep Headphones Sleep vs YINYOO, Lavales 6.0 vs Wentronic Y04: Hi-res Headphones, Kytok Gamer Gifts vs JINSERTA Gaming Headset: Game Headset