product specification Compatible with iOS / Android devices and multiple devices. Excellent sound quality, pure sound, comfortable to wear. ANR active noise reduction, block noise and enjoy listening to music. Touch control keys, popup window connection. Quick connection, easily connect your phone and hear music and voice calls clearly. Bluetooth 5.1 wireless transmission, Bluetooth range: 10 meters. 300mAh battery capacity, headphones battery capacity is 30mAh. 40 hours standby time, 4.5 hours for music, charging time 2 hours, support wake up Siri.