Design Product color: Black Efficiency Automatic volume control: Yes Headset mode: Yes Bluetooth profiles: HFP Bluetooth version: 5.1 Maximum range: 1000 m Device software updates: Yes Package contents Quick Start Guide: Yes Mounting kit: Yes Cables: USB Type-A to USB Type-C Number of pieces: 1 Battery Talk time: 15 h Charging time: 2.5 hours Rechargeable battery: Yes Safety warning Warnings Keep away from children. Check the condition of the batteries regularly to prevent leakage. Do not use near sources of heat or fire.