Description
The OYIB S75 is a sport oriented true wireless earbud built around flexible ear hooks, 13mm double layer diaphragm drivers and a claimed 50 hour total runtime. It sits in the crowded hook style workout segment, and its customer response is strong, at 4.4 out of 5 across 4,434 ratings with a placement of 323rd in earbud and in ear headphones. The specification data, however, contains one error that a buyer needs to understand before anything else on the page can be trusted, and it concerns the water rating.
The IP7 problem, stated plainly
Both the product title and one of the feature bullets claim an IP7 waterproof rating. IP7 is not a valid IP code. The standard requires two characters after the IP prefix, the first for solid particle protection and the second for water, with an X substituted where a category was not tested. IPX7 is a real rating meaning immersion in one meter of fresh water for thirty minutes. IP67 is a real rating adding full dust protection to that. IP7 is neither, and it is not a shorthand for either one, because there is no way to tell from it which position the 7 was meant to occupy.
Our position is that this product publishes no water rating at all. We will not describe it as waterproof, immersion rated, sweat resistant or splash resistant, because the manufacturer has not stated a code that means any of those things. The specification field simply reads Waterproof, which is a marketing word and not a rating. If sweat resistance is the reason you are buying, ask the seller for the exact two character code before ordering, and note in advance that no IP rating covers seawater, pool chlorine or pressurized water from a shower, and that seals degrade over time.
The listener this suits, and one use case to reconsider
OYIB lists the recommended uses as cycling, running, calling and exercising, and the hook design supports that intent. A hook that wraps the top of the ear is the most secure retention method available on a wireless earbud, and it is the reason this format dominates the gym segment. Three pairs of ear caps are included, which covers the seal sizing question that so many listings in this catalog leave open.
Cycling is the use case worth pushing back on. This is a sealed in ear design with silicone tips that block the ear canal. The Noise Control field reads None, meaning there is no electronic cancellation, but passive isolation from a sealed tip is substantial on its own and there is no transparency or ambient mode claimed anywhere on the listing. On a road bike, hearing a vehicle approach from behind is the single most important safety input available, and a sealed earbud removes a meaningful part of it. For riding on roads, an open ear design such as the Soundcore V30i or something else from our open ear headphones category is the appropriate tool. Use this one on a treadmill, in a gym or on a trail where traffic is not the risk.
Connection: Bluetooth 5.4 and nothing published behind it
Bluetooth version is listed as 5.4 in both the title and the specification block, which at least agree with each other. The bullet then explains this as three times faster transmission, more stable connectivity, lower power consumption and ultra low latency. Two of those are fair descriptions of what version increments address. The transmission speed claim carries no context, and the low latency claim carries no millisecond figure, so neither can be checked. A Bluetooth version number does not improve sound quality by itself.
Range is listed as 15 meters, which is a line of sight number. Auto connection on opening the case lid is claimed, which is a standard convenience feature. No codec is named anywhere on this listing, so SBC is the baseline assumption and nothing further can be inferred. There is no basis here for any high resolution claim. Multipoint is not claimed, no companion app is mentioned, and no equalizer is available as a result. Wear detection is not claimed.
ENC is not noise cancellation for the listener
The listing promotes a built in ENC microphone for clear calls. ENC operates on the outbound microphone path, improving what the person you are calling hears by suppressing background noise around you. It has no effect on what you hear during music playback. That distinction is worth holding onto, because the phrase noise cancellation appears in a great many budget listings where it refers only to the call path.
Battery: two figures, and one of them is unusually high
OYIB publishes both numbers, which is more than many rivals manage. Playtime is stated as 10 hours from a single charge, with a total of 50 hours including the charging case. Full charging over USB-C is stated as taking one hour. Those are internally consistent, since a case delivering roughly four additional charges of a 10 hour bud lands close to 50 hours.
Ten hours from the buds themselves is a strong figure, and the hook format is the reason it is achievable. A hook design has room for a larger cell than a stem or a bean shaped bud, which is a real engineering advantage rather than a marketing claim. The usual caveats still apply. Quoted playtime is measured at moderate volume, and higher volume shortens it substantially. The 50 hour figure describes the buds plus the case together, not the buds, and it should never be compared against another product’s bud only runtime.
A dual LED digital display on the case reports the remaining charge on both the buds and the case as numbers rather than indicator lights, which is a practical inclusion at this price.
The specification errors, and what else to look at
Several fields on this page are wrong in ways worth naming. Ear Placement and Form Factor both read Over Ear, and Earpiece Shape reads over-ear. This is not an over ear headphone. It is an in ear earbud with a hook that passes over the ear, which is an entirely different product class, and anyone filtering a shopping page for over ear headphones will be shown this by mistake. Item weight appears as both 0.1 kilograms and 3.52 ounces, which agree with each other at roughly 100 grams and describe the packaged product rather than the earbuds, since a single hook bud of this type weighs a small fraction of that. There is no Battery Life field in the specification block at all, so the 10 hour and 50 hour figures exist only in the bullet text. No driver material, impedance or sensitivity figure is published, and no frequency range is given.
One further point for buyers: a second listing of what appears to be the same S75 model exists in our catalog under a different ASIN as the OYIB S75 in an alternate listing, so check which variant you are actually ordering. Direct rivals on the same hook and long runtime formula include the Ltinist X29 and the ZINGBIRD T62. For a brand that publishes a real IP code and a documented support path, the JLab Go Sport is the safer buy, and more options sit in our wireless earbuds category.
Who should buy it, who should not
Buy it if you want maximum retention security for gym and treadmill use, you value a genuinely long 10 hour bud runtime, and you are comfortable with a product that publishes no valid water rating. Three ear cap sizes are included, the case reports charge numerically, and the customer rating is strong across a large sample.
Do not buy it for road cycling or road running, because it is sealed and no ambient mode is offered. Do not rely on it in rain, sweat or a shower on the strength of the IP7 label, because that code does not exist and nothing valid was published in its place. Do not expect app control, an equalizer, multipoint or any codec beyond the baseline. And ignore the Over Ear classification in the specification block entirely, because it is simply wrong.
