WARNING : ▪︎Adjust headphones sound to the proper volume. Loud sound may damage your ears. For traffic safety, never use the headset while riding a bicyle, motor bike, or while driving a car, it is dangerous to increarse the sound volume too much because you cannot hear external sound: take freat care about traffic around you.
▪︎Please wash hands after handling internal components and circuit boards and avoid instation of fumes if heating the solder.