I got mine bundled with my phone (Xperia 5 IV), which you can see also suffers Sony's inability to name products with anything more meaningful than a glorified serial number. These leave the ears fully open to ambient noise and generally sound better for music than bone-conduction headphones (which have limited frequency range). This was actually a begrudging change after losing my pair of the similar Bose SoundSport in-ear headphones after that product line was discontinued as well.