Bluetooth: 5.0 Protocol of Bluetooth: A2DP/AVRCP/HFP Audio Decoding Format: AAC?SBC Effective Distance: 10m Running Time: 4h+12h (with noise cancelling on);5h+15h (with noise cancelling off) Charging Time: 1h (earphones) + 1.5h (charging case) Input: 5v==200mA(earbuds); 5v=200mA(charging case) Frequency Range: 20Hz-20khZ Output SPL: 94±3dBspL(A) Rated Impedance: 24Ω