Soundcore Liberty Air True Wireless Earphones with Charging Case, Bluetooth 5, 20 Hour Playtime, Touch Control Earbuds, Graphene Enhanced Sound, Noise Cancelling Microphones and Secure Fit (Black) Expertly Tuned Graphene Drivers: As graphene?s earliest pioneers, we have used our experience to create a new driver for Liberty Air Bluetooth earbuds that takes full advantage of the material?s remarkable properties. 100 times harder than steel and 35% lighter than traditional driver diaphragms, it oscillates with extreme precision to give your music a wider soundstage with exceptional accuracy and clarity across the entire frequency range. Crystal-Clear Calls: Each earbud is equipped with a microphone that utilizes noise reduction technology. Your voice is optimized and background noises are minimized so you sound louder and clearer on the other end. Up to 20 Hours of Playtime: A full 5 hours of listening on a single charge is extended to a huge 20 hours of playtime with the included charging case. Integrated Touch Controls: Use the earbuds to answer calls and play, pause, and skip music on-the-go. Secure Fit: Liberty Air?s lightweight in-ear design and multiple sizes of EarTips allow you to customize the fit of the earbuds. Crank up the comfort level and enjoy music and stereo calls with superior noise-isolation.