We’ve reviewed a lot of true wireless earphones, but only a handful of them have been earbuds. The Microsoft Surface Earbuds are aptly named, as they don’t seal off your ear canal the way earphones do. The design looks cool and fits quite well, but without a proper ear canal seal, audio balance can be easily compromised, which negatively impacts the stereo image, making one ear seem much louder than the other.
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https://in.pcmag.com/headphones-1/140366/microsoft-surface-earbuds