Description
The OYIB S75 is a compact hooked sports earbud that OYIB describes as smaller than the usual ear hook design. It pairs 13mm double layer diaphragm drivers with Bluetooth 5.4, environmental noise cancellation on the microphones, three pairs of ear caps, a dual LED charge display, USB-C charging and a quoted 10 hours from the buds with 50 hours in total. The listing went live on February 14, 2025, and at the point this data was captured it carried 202 ratings averaging 4.8 out of 5, ranked 2,415th in Electronics, 343rd in Earbud and In-Ear Headphones and, oddly, 124th in Over-Ear Headphones. That third ranking is a categorization error rather than a product fact, and it is the first sign that the data behind this listing is thin. This is a new unit, not a renewed or refurbished one.
Who the hook design suits, and how little is published
Ear hooks hold the bud independently of the ear tip, which is what makes them worth the bulk. On a hookless earbud the tip has to grip and seal simultaneously, and the tip that grips best is rarely the tip that seals best. A hook separates those jobs, so the tip can be chosen purely for seal. OYIB’s angle is that the S75 does this in a smaller housing than most hooked sets, which addresses the main complaint about the format.
What has to be said plainly is how little this listing publishes. The structured specification table contains no Bluetooth version field, no battery field, no water resistance field, no driver size field and no noise control field. Everything factual on this page lives in the marketing bullets, which are not held to the same standard. The specification table does contain a form factor of “Over Ear” alongside an ear placement of “In Ear”, which contradict each other, and a battery description of “1 12V batteries required”, which is nonsense for an earbud. Read the bullets, treat the table as unreliable, and ask the seller to confirm anything that matters to you.
Connection: Bluetooth 5.4 with no codec
OYIB states Bluetooth 5.4 in the feature copy, claims transmission three times faster than an unnamed predecessor, and describes automatic reconnection when the case lid opens. Bluetooth 5.4 governs connection stability, power draw and LE Audio groundwork. It does not improve sound quality on its own, and the ultra low latency claim comes with no millisecond figure, so there is nothing to compare.
No codec is named anywhere on this page. SBC is the universal baseline and is what you should assume you are getting. AAC, the codec that matters on iPhones, is not stated, and neither aptX nor LDAC is stated, both of which require the phone and the earbuds to support them before they change anything. No wireless range is published. Multipoint is not mentioned. There is no companion app, no equalizer, no transparency mode and no firmware update path described.
The ENC microphone is the only noise feature described, and it is call side: it improves what the person you are speaking to hears, not what you hear. No active noise cancellation is claimed, and on a sports set that is a reasonable position, since some ambient awareness is usually welcome during exercise.
Battery: ten hours in the bud, fifty with the case
OYIB quotes 10 hours of playtime from a single charge and 50 hours in total with the case, charging fully over USB-C in about one hour. Those two figures are stated separately, which is the honest way to publish them, and a ten hour bud runtime is strong. Hooked housings can carry a larger cell than stemless designs, which is the usual reason these sets outlast their smaller rivals.
What is missing is any way to check the 50 hour claim. No case capacity in milliamp hours is published, and no recharge count is given, so the relationship between the ten hour bud figure and the fifty hour total is asserted rather than shown. A one hour full charge for a case that supposedly holds four further bud recharges is fast, and worth confirming. Plan around ten hours per bud, which is the number that governs your training week, and remember that quoted playtimes assume moderate volume on a new cell.
Fit and an invalid water code
Three pairs of ear caps are supplied, which combined with the hook should give most people a workable fit. The hooks are described as flexible and soft, and the housing as smaller than typical for the format. No weight is published for the buds themselves; the 3.84 ounce figure in the table is the packaged weight.
The water claim is not valid as written. Both the listing title and the feature copy state “IP7 waterproof”. IP7 is not an IP code. The standard requires two characters after IP, one for solids and one for liquids, with an X where a figure is not rated, so IPX7 and IP67 are codes and IP7 is not. The specification table publishes no water resistance field at all to clarify it. That means no valid rating exists on this page. Treat the set as unrated, plan around sweat and light rain at most, and do not submerge it. No IP rating covers seawater, chlorinated pools or pressurized water, ratings do not extend to the charging case unless stated, and seals degrade with age and sweat exposure. On a product sold specifically for workouts, a missing valid code is a real gap rather than a technicality.
One further caution about the format: a sealed earbud held firmly in place by a hook is the least suitable thing to wear on a road, because it removes the traffic sound you need. Indoor training and track running are fine. Roads are not.
What to compare it against
OYIB appears more than once in this catalog with differing specifications, so read the other OYIB S75 listing, published under a separate ASIN alongside this one, and the OYIB MD058A, a different housing from the same brand if the hook is not what you want. Among hooked sports sets, the EUQQ Q63-1, which quotes an unusually long 18 hour bud runtime is the endurance comparison, and the JBL Endurance Peak 3, which publishes a valid IP code and a full specification is the established brand option that does the disclosure properly. Our wider coverage sits under wireless earbuds and earbud headphones.
Who should buy it and who should not
Buy the S75 if you want a hooked sports earbud in a smaller than usual housing, a ten hour bud runtime suits your training, and you are content with SBC audio and no app. Do not buy it if you need a valid published water code, because IP7 is not one. Do not buy it if you need a specification table you can rely on, because most of this one is either empty or wrong. And do not wear it on the road.
