AGPtEK Apt-X Bluetooth Wireless Headphones Deep Bass for Sport, Hiking, Yoga, Gym, Jogging with4 Ear Bud Tip, Build-in Mic Bluetooth 4.1 Support the Apt-X Technology, provides high-fidelity and high-quality stereo music! Ergonomic designed : Comfortable and lightweight wireless earphones with ear tip, very secure under state of motion. Standby time:Long lasting 10 hours li-ion battery, satisfy your spare time. 1.5 hours charging time with USB port. Function:build-in microphone and hands-free, sweat- and water-resistant design for increased durability. Comfortable, stable and built for movement. AGPtEK Bluetooth headset has an active design, so that the earphones fit comfortable and will be fixed at any level during training.