Qualcomm Bluetooth 5.0, APTX/ACC supported Wireless charging, long-lasting Unique color scheme, elegant and chic CVC 8.0 noise cancellation technology 14.2mm biology fibre driver Auto pair once take out, exchangeable principal and subordinate earbuds -40 hours playtime Model: VOOPLAY Impedance: 32ohms Charging interface: Type-C Power input: DC/5V Bluetooth version: 5.0 Bluetooth agreement: A2DP/AVRCP/HFP/HSP Audio decoding: Qualcomm APTX/AAC/SBC Transmission distance: 10m Sensitivity: 101+/-3db@1k, 1mw Battery capacity: 3.7V/50mAh Charging case capacity: 3.7V/390mAh Charging time: about 60 mins Call time: 6+ hours Frequency response: 20-20000Hz