Bluetooth wireless technology with in-line mic and controls for convenient handling of calls music playback and volume adjustment Built-in 4 GB music player lets you work out without your smartphone High-sensitivity 6 mm drivers with a powerful magnetic circuit and dedicated headphone amplifier deliver strong high-fidelity audio Switchable ambient noise hear-through function allows you to hear people and traffic around you for safer use outdoors When not in use earbuds’ built-in magnet sensors can be linked together automatically pausing music playback Included Components: Headphones, Eartips (Xs, S, M, L), Ear Fins (Xs, S, M, L), 40 Cm (16") Usb-A/Usb-C Charging Cable, And Carrying Pouch