I've been listening to Whizzer C3 for more then a week now and I still don't know if I love or hate them more. Everything is somewhere halfway between a cheap crack and a touch of premium. The package looks luxurious, but with only common content. The great thing is that most standard eartips fit to the C3, they don't have a problem even with the longer Spinfits CP100, only most of foam tips don't fit. The charging case looks usually, but even though it has 2 different colored LEDs, it has no indication of the current battery charge status. When opened, the lid wobbles like an old garbage, but on closer inspection I found that fortunately the entire hinge is metal, so not as bad as it looks. There is only micro USB, but it should support wireless charging. The inscription on the lid of the case promises a battery capacity of 1000mAh, but according to my measurement, the real capacity is a ridiculous 380mAh/5V and that seems not enough for a case with dimensions of 70x45x33 mm. I was a little skeptical about the strange pear-shaped earbuds, but I have to admit that such a comfortable and at the same time secure fit in my ear could be envied by many IEMs, as soon as you push them in your ear, they don't move here and don't protrude significantly from your ears like some others TWE. Whizzer probably wanted to save money even on the print, therefore the channel marker is only on the right earbud

The battery capacity of the buds is not mentioned anywhere by the manufacturer, but according to my measurement, 60mAh comes out on each side and therefore the endurance per charge is solid. At a comfortable volume and without switching the master bud C3 played continuously for 5 hours in stereo with AptX, while over 50% of the capacity still remained on the slave earbud. Both are then fully charged in 75 minutes. It's stupid that they will only alert you about the discharge by flashing LEDs, then just stop playing and turn off himself. How much is Whizer "careful" during testing (if any tested at all) is obvious by the fact that although their official name is COOPBUDS C3, it will connect to the devices as CONPBUDS C3

The biggest disappointment for me is the absence of the promised volume control, I need this feature and without it I would never bought it! When I wrote to the seller about it, instead of apologizing, he replied me "the volume control means that control the volume on your phone". I don't like when someone makes a fool of me and I still can't forgive to the official Whizzer seller on AliExpress for the strange business tricks, when he writing fake anonymous reviews himself to improve the rating of his goods, he has already written more than 400 of fake reviews for C3! Whizzer should instead spend their time to checking and correctly describing their goods.
But that doesn't belong here, so let's talk about the sound, it definitely pleased me more on the C3. There is one 10mm dynamic driver on each side and it can be felt! There is no compensation hole anywhere, maybe due to IPX protection, so the C3 is not only extremely loud, but also overly bassy. On C3, no one will complain about the boring sound, it's like a wild animal! On the FR graph you can see the madness compared to TrueDots, which are in themselves considered bass heavy TWE for someone. It might seem like a disaster, but it's not true. It's a typical V-shaped sound, but fortunately the used driver is one of the better. Even with such accentuated bass, the vocals sounds very pleasant, as well as the trebles, which even offers plenty of details. Although probably a little simplified, but clean enough. I just still feel like I'm wearing big headphones and not only small earbuds. I listen mostly to rock, metal, electronics and in some songs from groups like Breaking Benjamin, Asking Alexandria, Shinedown etc. this C3 sounds in critical faster places a bit better, than otherwise great TrueDots, or even often some overcombined wired hybrids, such as TRN V90. I can clearly hear every kick in the drum and cymbal punches, even with enough reverberation, really like how the drums and percussions sounds on C3. The guitars and vocals have a powerful drive and enough space, nothing squeaks anywhere, no annoying piercings. Of course, quantitatively there are more basses than everyone need, but tanks to this I can listen to the C3 even at a lower volume with enough energy. To me C3 make bass more pleasant and interesting compare to TrueDot thanks to the overall composition with the trebles. C3s definitely do not have as too dark or warm sound as stock TrueDot (QCC3020). The sound isn't audiophilic, it's a bit simplified somewhere, sometimes you may feel a lack of mids, but it's dangerously addictive, fun and musical. I would be afraid to recommend them to everyone and Whizzer definitely doesn't deserve advertising for them, but if you're a bass-loving rocker, that sound will get you. Personally I like that sound and with C3 finding that I'm already using wired IEM less and less!