Design Product color: Black Efficiency Device software updates: Yes Bluetooth profiles HFP AVRCP A2DP Maximum range: 1000 m Bluetooth version: 5.2 Headset mode: Yes Automatic volume control: Yes Package contents Quick Start Guide: Yes Cables: USB Type-A to USB Type-C Number of pieces: 2 Mounting kit: Yes Battery Rechargeable battery: Yes Charging time: 2.5 hours Talk time: 15 h Safety warning Warnings Check the condition of the batteries regularly to prevent leakage. Do not use near sources of heat or fire. Keep away from children.