Set Contents: BlitzWolf® BW-FYE1 TWS True Wireless Earphones with Charging Box Stereo Headphones Micro USB Charging Cable Ear Caps (3 sizes) Manual The dedicated case can be used as a charging box and storage case. The size is easy to fit in your pocket, making it easy to carry around. The instruction manual is available in English, French, Italian, and Japanese. It has IPX4 waterproof performance, so it's fine if it gets lightly splashed with water. It's perfectly fine if you use it for running and sweat gets in. There is a button on the Bluetooth earphone itself, and pressing this button twice in a row will advance the music to the next song. Pressing it once will pause the music. Please note that you cannot adjust the volume with the earphones.