⭐️Works Perfectly⭐️ All boxes and manuals are included. Overall, it's in beautiful condition, but due to normal use and long-term storage, the left earphone has some stickiness. I've done my best to maintain it, but please refrain from purchasing if you are overly concerned. When used with a Galaxy smartphone, you can use dedicated apps like an equalizer. Of course, it can also be used with smartphones other than Galaxy. Furthermore, you can put music on the main unit and use it standalone. Instant purchase without comment is OK! Other products are here #CrystalBoy✨