At its core, the Sony WI-SP600N is all about packing cutting-edge tech into a wireless in-ear headphone. The sporty and active theme behind these is obvious, given the IPX4-rated sweat resistance, but throw in noise-cancellation and an ambient sound mode, and you’re supposed to get a pretty versatile pair of wireless earbuds here.

…And yet, in spite of all the extra tech, the end result is a product tries to do too much without getting the basics – like fit and fidelity – down pat.
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https://www.techradar.com/reviews/sony-wi-sp600n-wireless-headphones