1 Function Built in microphone you can answer the phone listen to music etc 2 Multifunctional use can be used as Bluetooth headphones hair bands hair bands wrist guards etc 3 Moisture absorbing and sweat conducting loose fitting suitable for the size of the head circumference will not cause tightness of the head4 Adopt the pattern label technology flat and beautiful5 Endurance 180 mAh battery capacity 12 hours of continuous endurance6 Bluetooth protocol 5 0 EDR7 Transmission range no obstacles more than 10 meters8 Sound channel bilateral stereo9 Material acrylic polyester10 Charging time about 1 5 hours