HearID is an absolutely useless thing (although the idea is interesting). In fact, it's just equalization, which "crooks" the sound depending on which frequencies you hear worst or best. The output is usually a terrible picture, even lower quality than in stock. I put 2 stars only for the overall technical performance, with which everything is fine. But the sound is a failure. Taking into account all the technologies used (LDAC codec with enough space in the case for its good implementation + a hybrid circuit), it was quite realistic to create TWS that can not only sound GOOD, but sound so that the owners of average Hi-Fi players and inexpensive wired IEMs thought about the feasibility of their setup. But, alas, Anker followed the lead of the mass market and created . rubbish. Lousy V-shaped low-quality hybrid sound. To be fair, the following should be noted. To a mass listener who: - Cannot build at least some criteria for the sound except "Well, I want the bass to be cool, and the sound is clear"; - Not able to compare them even with something other than even more low-quality consumer goods (in the face of Sony WF1000, Sennheiser Momentum TWS or AirPods); - I am ready to spend a rather big amount on high-quality (I emphasize: PERFORMED, not SOUNDING) headphones; ., such a product may well be to your liking. And even with a very narrow genre selection in music like "Pops, rap and any other primitive electronics", the headphones may well impress: A lot of oppressive plump bass, a lot of pseudo-detailing, the effect of an inflated "scene" due to the emphasis on everything above 10kHz and a dip in the middle, and so on. The overall performance (assembly, functionality, noise reduction, fit, etc.) is just fine. But the sound (if there is a request for it and at least some comparison experience) is rubbish.
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