XO X13 are 5.1 TWS bluetooth in-ear headphones with charging box. The headphones support TWS (True Wireless Stereo) technology - both headphones connect to each other to create a wireless stereo set. A portable box with a built-in battery, in addition to the charging function, allows you to safely store the headphones in your pocket, bag or backpack. They are compatible with most Android and iOS devices. The headphones also have a microphone, so you can easily make voice calls. The duration of calls/listening to music on a full charge is approximately 240 minutes (depending on the volume level), thanks to the use of energy-saving Bluetooth 5.1 technology.