Specificationbluetooth version V4.1 (A2DP+ SPP+ BLE)SNR94db Talk distance 10 M Start-up Mode Long press multi-functionn key for 3s Start-up Flashing Light Mode 3LED quick flashing simultaneously with 2hz frequency Pairing State Long press multi-function key for 5s Pairing Flashing Light Mode 3LED running lights flashing Manual Shutdown Long press multi-function key for 4s Shutdown flashing light mode 3LED quick flashing for 3 times with 2hz frequencycharging voltage range DC5 V Charging current 300ma Package Included:1x Smart Bone Conduction Headset