1. Foldable headband and lightweight design, is not only for saving your desk space but for carrying in your bag or pocket, and more lighter weight than other neckband headphones in the market and more flexible. 2. Silicone earplugs, comforms to your ear. These are 3 sizes of earplugs to ensure a custom comfortable fit, sealing the ear to deliver bass and isolate noises. 3. Good sound quality: good call quality and microphone. Even on a noisy treadmill, you can clearly hear each other. 4. Built-in microphone, can answer / hang up calls and switch music 5. Suitable for all kinds of sports occasions, such as running, jogging, hiking, cycling, etc 6. 3.5mm headphone jack 7. Package list: - Mucro headphones x 1 - Earbuds x 3 pairs (S/M/L) - User Manual x 1 - Born for SportsOur neckband headphones are designed with an ergonomic neck shape that evenly distributes the weight around your neck. Whether youre running, walking, jogging, or engaged in weight lifting or gym training, this design ensures a secure fit and maximum comfort, so you can focus on pushing your limits - Foldable & LightweightThe running headphone is foldable headband, is not only designed for saving your desk space but for carrying in your bag or pocket and more lighter weight than other sports earphones in the market and more flexible - Comfortable Wearing & Snug Fit EarThe athletic earphone is equipped with three pairs of ear pieces of different sizes for different ear shapes. The silicone earplugs can fit the ear canal very well, and it will not be painful even if worn for a long time. It also comes with a high reflective patch on the band, if you like night running, the coming cars can see you easily and avoid the dangers - Multi-Funtional Mic ContralThe over ear earbuds wired integrate Microphone/ Phone Control/ Music Playing functions in a line button. Phone calling: single click to answer or hang up; Music playing: single click to play or pause; double-click to next song; Triple-click to previous soon - 1-Year Guarantee:Should you have any issues at all with your sport earbuds, well either provide a replacement. Life Time Technical Support with 12hr- response via Email, Live Chat etc