Design Security features: Waterproof Product color: Black IP protection class: IP67 Efficiency Automatic volume control: Yes Headset mode: Yes FM Radio: No Bluetooth version: 5.1 Device software updates: Yes Bluetooth profiles: HFP Maximum range: 500 m Package contents Mounting kit: Yes Cables: USB Type-A to USB Type-C Quick Start Guide: Yes Number of pieces: 2 Battery Talk time: 10 h Rechargeable battery: Yes Charging time: 3 hours 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.