Aluratek ABH02F. Device connectivity: Wireless, Device interface: Bluetooth, Frequency band: 2.4 GHz. Ear coupling: circumaural, Headphone frequency: 20 - 20000 Hz. Battery life (max): 12 h, Battery technology: Lithium-Ion (Li-Ion), Charging time: 3.5 h. Cables included: USB. Bluetooth profiles: A2DP, AVRCP, HFP, HSP, Bluetooth version: 2.1+EDR, Connector(s): USB 5V