Bluetooth Version: V4.1 Operating range: Wearing Type: Super Mini Function: Answering Phone, Microphone, Noise Cancelling, Stereo, i OS Power Display Talk Time: 4 Hours Music Time: 4 Hours Standby Time: About 45 Days Charging Time: About 1 Hours Bluetooth protocol: HSP, HFP, A2DP, AVRCP Chip: CSR Battery Type: Built-in Rechargeable Battery Bluetooth Headset