FIXED Boom Joy hold perfectly in your ears, isolate ambient noise and you can easily forget that you have them in your ears while listening thanks to their minimal dimensions and weight. Despite their size, the earphones provide a perfect music experience, clear treble and rich bass. When playing music, the built-in earphone battery lasts up to 3.5 hours, and when inserted into the charging case, they immediately start charging for further listening. In total, with the charging box, the FIXED Boom Joy earphones will provide enough energy for up to 22 hours of operation. You can check the current battery status via the LED display in the charging case. Touch control directly on the body of the earphones will regulate the volume or movement in the playlist. With the built-in microphone, you can comfortably make a phone call with the FIXED Boom Joy earphones.