SpecificationsEarphone TypeOver-Ear ANC Headphone Bluetooth VersionBluetooth V5.2ANC YES, Active Noise Cancelling ANC Performance about -20dB, digital ANC (entry level ANC)Speaker Rated Power 20mW Speaker Diameter 40mm Microphone4 MEMS MicrophoneBattery400mAh Music Playback HoursUp to 25 Hours Music + ANC Play HoursUp to 15 Hours Input Voltage & CurrentDC3.7V @500mA to 1A Charging PortType C Charging Hours2 Hours