Lenovo AirPods Pro Wireless Earphones: Charging: Wireless charging supportBluetooth Version: 5.1Stereo Channel System: YesFrequency Response: 20 Hz - 20 kHzCharging Compartment Input Voltage: 5 V, 500 mAPlaying Time: Approximately 3 hoursHeadphone Battery Capacity: 40 mAhCharging Case Battery Capacity: 300 mAhDrive Unit: 13 mmCharging Time: 1 hourCall Duration: Up to 3.5 hoursMusic Duration: Up to 3 hoursSupported Protocols: HSP / HFP / A2DP / AVRCPCharging Standard: 5V DC inputBluetooth Operating Frequency: 2.402G - 2.480GMaximum Transmission Distance: 10 m / 32.81 ftMulti-Point Connection: YesPackage Includes:1 Pair of Earbuds1 Charging Case2 Pairs of Earcaps