AfterShokz (currently Shokz) bone conduction headphones. There are no issues with the operation. I used them for about a year. There are no accessories. They can be charged with Type-C. I tested the battery consumption. After using them for about 2 hours and 20 minutes, an announcement saying "Battery is about half" was played. (Tested with music playback on a smartphone at medium volume) The official battery life is 6 hours.