Awei A710BL Over The Ear Noise Cancelling Headphone Handsfree Bluetooth Wireless HiFi Bass Headset Bluetooth Version: 5.0 Battery Capacity: 300mAh Play Time: 20h Charging Time: 2h Diameter: 40mm Impedance: 32Ω Sensitivity: 98±3dB at 1000HZ Best Transmission Distance: <1M Maximum Transmission Distance: 10M Wearing Method: Head-Mounted User Manual: Chinese/English Accessories: USB Cable/User Manual/AUX Cable