Description
A light budget earbud with a heavily embellished listing
The Rinsmola G21 Pro is a stemmed true wireless earbud aimed at gym and commute use at the cheap end. The physical product is conventional for the class: a light housing, touch controls, three ear tip sizes, a small case with an LED charge readout and USB-C charging. Customer feedback is good at 4.5 out of 5 across 1,218 ratings, with Amazon placing it around 193rd in Electronics and 40th in earbud and in ear headphones.
The listing wrapped around it is another matter. It is one of the more percentage heavy pages in this catalog, and almost none of those percentages have a baseline attached. Separating the checkable facts from the decoration is most of what this review does.
Connection, and two latency figures that disagree
Bluetooth 5.4 is published, with a quoted range of 20 meters. The version number is not a sound quality specification. It affects connection stability, power behavior and support for newer standards, and it does not change what a driver does. Rinsmola adds a flash pairing feature for faster first connection, which is a normal convenience.
The claims with no baseline, and the one number worth having
The first bullet asserts that, compared to the previous version, power consumption is reduced by 30 percent, signal stability is improved by 35 percent and interference immunity is increased by 45 percent. No previous version is named, no measurement method is described and no test conditions are given, so none of those figures can be checked. The second bullet claims the drivers boost bass by 85 percent and that ENC filters out 80 percent of environmental noise. Both are unattributed and unmeasurable in the form given. We are flagging them rather than repeating them as features.
Latency is where the page contradicts itself outright. The bullet says 0.1 seconds of ultra low latency, which is 100 milliseconds. The structured specification field says audio latency is 31 milliseconds. Those differ by more than a factor of three, and 31 milliseconds would be an unusually good figure for a Bluetooth earbud with no proprietary low latency link. We are naming the contradiction rather than choosing. If latency matters for video or gaming, ask Rinsmola which figure is real.
No Bluetooth codec is named anywhere. Not SBC, not AAC, not aptX, not LDAC. SBC is present by definition, but nothing else is confirmed, so the phrase Hi-Fi stereo in the title has no published specification behind it, and there is no basis for a high resolution claim. The ENC system works on the microphone path for calls and does nothing for what you hear. The structured field correctly lists noise control as passive, confirming there is no active noise cancellation, no transparency mode, no app, no equalizer, no multipoint and no wear detection.
Battery, with the totals arranged confusingly
Rinsmola quotes 6 to 8 hours of playtime from a single charge, which is an honest range rather than a single flattering number. The bullet then says the case provides an extra 36 hours, while the product title says 36 hours is the whole figure. The structured data settles it in a third direction: the case is rated at 28 hours of reserve, and 8 hours in the buds plus 28 in the case comes to the 36 hour total in the title. So the bullet describing 36 extra hours from the case appears to be wrong.
Use the numbers this way. Six to eight hours is what decides how long a session runs before the buds return to the case. Thirty six hours is the total across roughly four case refills between wall charges. The case holds a 350mAh cell and recharges in a quoted 1.5 hours over USB-C, with a dual LED display showing both case and bud charge. As always, the bud figure assumes moderate volume, and there is no active cancellation here to add a second variable.
Fit, seal and an IP code that does not exist
Three sizes of soft silicone ear caps ship in the box, listed as six pieces in small, medium and large pairs. That is the standard count, and seal decides perceived bass on any sealed earbud, so work through all three before judging the low end. Each bud is quoted at 3.6 grams in the bullet and 3 grams in the specification field, a minor disagreement but a disagreement. The case is 34 grams.
The driver is published at 14.2 millimeters and described as graphene with a triple layer composite diaphragm. Impedance is 32 ohms and sensitivity is 108 dB, which is a plausible and useful figure. Frequency response, however, is given as a single value of “20 KHz”, which is not a response specification at all.
The water rating does not exist as written. The product title says IP7 waterproof. IP7 is not a valid IP code: the system takes two digits after the letters, the first for solid particle ingress and the second for water, with X substituting where a digit was not tested. IPX7 is valid, IP67 is valid, IP7 is not. The third bullet writes it as “IP-X7”, with a hyphen that is not part of the standard, and the bullet is truncated before it explains what protection that covers. The structured field says only “Waterproof”, which is a word rather than a rating.
What that leaves is no reliable protection claim. If you intend to train in these, treat them as unrated and ask Rinsmola for a properly formatted code. No IP rating covers seawater, chlorinated water or pressurized water in any case, and seals degrade with age.
Who this is sold to, and one thing worth setting up first
The age range field on this listing reads “Kid, Teen, Adult”. Nothing else on the page addresses what that requires. There is no volume limiter mentioned, no maximum output figure and no way to estimate how loud these get from a given source. We are not going to describe this product as safe for a child’s hearing, because the listing publishes nothing that would support it, and a volume limit is only meaningful when it cannot be bypassed. If you are buying for a child, set an output limit on the phone or tablet itself and check it periodically, because that is the only control available here.
The theme field also lists Riding among the intended uses. We would rule that out. This is a sealed in ear design with passive isolation and no transparency mode, so there is no way to admit ambient sound short of removing a bud. It is not appropriate for cycling or road running where hearing traffic is a safety requirement, for an adult or a child. If awareness while moving is the actual need, our open fit headphone listings are the right category.
The rest of the data, and what to compare against
The batteries field says “2 A batteries required”, describing disposable cells that have no place in a rechargeable earbud. Number of items reads 5. The carrying case is listed as 2 centimeters long by 4 centimeters wide by 4 centimeters high, which would be a case smaller than the buds it holds. Headphones jack is listed as USB on a product with no jack. Product dimensions of 0.79 by 1.18 by 1.57 inches are more plausible for the case than the box.
For a budget earbud in the same bracket that actually names its codecs, see our xinwld A97 Pro review. For alternatives that publish a bud runtime clearly, our ZZU T18 review and our Foxotin T16 review are the closest comparisons. For a longer established option at a similar price, the TOZO T10 review is the sensible benchmark. Broader options are in our wireless earbud listings.
Buy or skip
Buy it if you want a very light, very cheap earbud with a published sensitivity figure, a case that reports its charge, and 6 to 8 hours between case visits suits you. Skip it if you need a named codec, active cancellation, an app or multipoint. Skip it if you need a water rating you can rely on, because IP7 is not a valid code and the hyphenated version in the bullet is not standard either. Ask Rinsmola which latency figure is correct before ordering if video sync matters to you.
