Compatible with: 18V battery packs. It's the perfect addition to your toolbox. The speaker will automatically shut down if the battery voltage is below 15.5v to prevent any overload damage. Effortless Connectivity: Speaker supports two types of connection. Bluetooth 5.3 ensures rapid & stable pairing with your devices. Strong connection is guaranteed up to 52 ft. USB audio source is also supported. Simply plug-in the USB disk into the USB-A port for music playing.