Vivanco Stereo Bluetooth Headset. Headset type: Binaural, Colour of product: Black. Connectivity technology: Bluetooth. Bluetooth version: 2.1+EDR, Bluetooth profiles: A2DP, AVRCP, HFP, HSP. Acoustic system: Semi-open. Battery technology: Lithium-Ion (Li-Ion), Talk time: 9 h, Standby time: 240 h