Item Name: Bluetooth EarphonesMaterial: ABSImpedance: 32ΩBluetooth Protocol Support: APD, AVRCP, HSP, HFPBluetooth Version: V5.1Charging Compartment Battery Capacity: 2000mAh (Battery Included)Earphone Battery Capacity: 50mAh (Battery Included)USB Charging Output: 5V, 1AUnit Diameter: 8mm