Design Security features: Waterproof Product color: Black IP protection class: IP67 Efficiency Maximum range: 1600 m Headset mode: Yes Bluetooth profiles AVRCP A2DP HFP Device software updates: Yes Automatic volume control: Yes FM Radio: No Bluetooth version: 5.2 Package contents Number of pieces: 2 Cables: USB Type-A to USB Type-C Quick Start Guide: Yes Mounting kit: Yes Battery Rechargeable battery: Yes Talk time: 18 h Charging time: 2.5 hours Safety warning Warnings Check the condition of the batteries regularly to prevent leakage. Keep away from children. Do not use near sources of heat or fire.