OYIB MD058A Wireless Earbuds Review: Semi In Ear Fit, ENC Calls and an Invalid IP7 Water Code

Description

The OYIB MD058A is a semi in ear true wireless set, ASIN B0C7VFL78Q, listed since August 2023, with a 4.4 star average across 522 ratings and a rank of 2,462nd in Amazon’s Earbud and In-Ear Headphones category. It is a more detailed listing than most in this bracket, publishing a driver size, a Bluetooth version and a per charge battery figure. It also contains one of the most common data errors in this catalog, which is worth handling first: the water rating.

The listener this suits, and the fit that decides it

The key specification here is that this is a semi in ear design. The bullet describes a “semi-in-ear acoustic structure”, which means the bud rests in the outer ear rather than sealing the canal the way a silicone tipped bud does. That has two consequences that matter more than anything else on the page.

First, you will hear your surroundings. A semi in ear bud does not block much, which is safer near traffic than a sealed design and better for an office where you need to hear someone speak. Second, perceived bass depends on how the shell happens to sit in your ear, and it varies far more between people than a tipped design does. There are no ear tip sizes listed for this product, so there is no way to adjust the fit if it does not suit you. If you have found sealed buds uncomfortable, this shape is worth trying. If you want isolation on a plane, it is the wrong shape entirely, and something like the Jabra Elite 3 with sealed tips makes more sense.

Because the fit is unsealed, a second hearing point follows. In loud places an unsealed bud tempts you to raise the volume to overcome the room, and that is where the risk sits. Keep the level where you can still hear a conversation.

Connection: Bluetooth 5.3, a hall switch and a latency claim

The listing states Bluetooth 5.3 with a 10 meter range, roughly 33 feet, which is the ordinary line of sight figure. Version 5.3 improves connection stability and power draw and adds groundwork for LE Audio; it does not raise audio quality by itself. The bullet claims audio delays “much lower than 65ms”, which is a plausible band for a low latency mode, though no measurement method is given and latency depends on the source phone too.

The set uses a hall switch, meaning the magnetic case lid triggers power and pairing, so the buds reconnect when you open the case. Either bud works alone, and the copy describes switching between single ear and dual ear mode by touch, which is a genuinely useful feature for calls. Multipoint pairing to two source devices at once is not mentioned. Neither is an app, transparency mode or wear detection, so assume none exist.

Microphones, ENC and the lossless wording

Four microphones total, two per bud, running Environmental Noise Cancellation. ENC works on the call side: it cleans up what the person on the other end hears, and it does nothing about what reaches your own ears. The listing claims ENC suppresses 80 percent of background noise during calls, and names no test standard or measurement method for that figure, so treat it as a manufacturer claim rather than a specification.

The same bullet uses the word “lossless” while describing call clarity. No codec is named anywhere in this listing, and lossless audio over Bluetooth requires a specific codec supported by both the phone and the buds. There is no SBC, AAC, aptX or LDAC claim on this page. The lossless wording is marketing language applied to a voice call and is unsupported by the published specification.

Battery: five hours per charge, and a field in the wrong place

The bullets give 5 hours of playback per charge and 25 hours in total with the charging case, which is the split you want to see. Five hours is modest by 2025 standards and is the figure to plan around; 25 hours is how long the whole system runs between wall charges. Both are best case numbers at moderate volume.

Two specification fields undercut this. “Charging Time” reads 25 Hours, and “Carrying Case Battery Charging Time” also reads 25 Hours. Twenty five hours is the total playtime figure, not a charging duration, and no case takes a day to charge. The bullet elsewhere states the case charges fully in about an hour over USB-C, which is the credible number. Read those two fields as the playtime figure leaking into the wrong slot.

If runtime is the deciding factor rather than the unsealed fit, sets built for longer days such as the Sprtoybat Q35 publish larger totals in the same price band.

Water rating: “IP7” is not a valid code

The fifth bullet says “IP7 Waterproof” and the specification field says “Water Resistance Level: Waterproof”. IP7 is not a valid IP code. A real code has two positions, one for solids and one for liquids, which is why you see IPX4, IPX5 and IPX7. “IP7” on its own does not tell you which digit is which and cannot be checked. The correct reading is that no water rating is published for this product.

The bullet text describes nano coating that “can effectively prevent splash damage caused by sweat and rain”, which is a splash resistance description consistent with something around IPX4, not immersion. Do not submerge these, do not shower in them and do not rinse them. Even a published IPX7 would not cover seawater, chlorinated water or pressurized water, and seals degrade with age.

The listing also records “Recommended Uses: Cycling, Running, Exercising”. Because this is a semi in ear design, outdoor awareness is better here than on a sealed bud, but a bud that can loosen is still a bud that can drop into traffic, and no listing should be the reason you choose road use. The specification is internally inconsistent on shape as well: “Ear Placement” reads In Ear while “Form Factor” reads Over Ear, and “Theme” reads “Anime”, which is inherited junk from another category.

The rest of the specification, and where to compare

The driver is given as 13 millimeters, which is large for this shape and is one of the few audio figures published. There is no frequency response, no impedance and no sensitivity figure. Per bud weight is quoted in the bullet as 4 grams, while the specification lists 30 grams and 1.06 ounces, which are the same package weight in different units rather than a conflict. The box contains the two buds, the USB-C case, a cable and instructions.

For alternatives in this unsealed shape, the TOZO OpenBuds and the HUAWEI FreeClip take the same open approach with more published detail. The wider selection is in the true wireless earbuds section.

Who should buy this, and who should not

Buy it if you dislike sealed tips, you want to keep some awareness of your surroundings, and 5 hours per charge covers your listening. The 13 millimeter driver, the single ear mode and the four microphone call setup are real features at this price, and 522 ratings at 4.4 stars is a reasonable signal.

Do not buy it for isolation, for flights or for anywhere you need to block noise, because a semi in ear design cannot do that. Do not treat “IP7” as a water rating. And before ordering, ask the seller for the actual IP code and confirm that the case charges in about an hour rather than the 25 hours the specification field claims.

Additional information