High fidelity stereo sound, catches every detail of the music and transmits rich sounds, ensures a crystal-clear listening experience for both phone calls and music. The ear buds come in 3 sizes and please choose the most suitable ones.Features:Up to 10h music enjoyment, lower energy consumption and provides 10h playtime, 300h standby time. It only takes 2h to be fully charged. Besides, you can check the battery status on your phone.Dual connection and hands-free calling, bt 4.1 technology ensures faster and more stable connection. Besides, this product can stay connected to 2 devices at the same time, making it easier for you to transfer to another device for calls or music.25 slanting ergonomic design, special slanting-shape together with ear wings not only keep the earphones more stable but also assures a lot more comfort on ears since it fits the structure of the ear and will make you feel like the earphone is weightless.With nano coating, can withstand sweat, water and rain, suitable for strenuous exercise and various weather conditions. Ideal for jogging, running, fitness time, boating, cycling and other sports.Specifications:Color: blackBT: 4.1Charging time: 2hTransmission distance: 15mBattery: 3.7V, 110mAhPackage size: 107 * 85 * 40mm / 4.2 * 3.3 * 1.6inPackage weight: 58g / 2.0ouncePackage list:1 * Pair of Earphone1 * Charging Box