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. Compact Size + Astonishing Sound: Come with compact size, provide strong and powerful sound at the same time. With a press of the button, the speaker will liberate deep, rich and clear sound with zero distortion through the 20W built-in speaker. It's small and light enough to take it with you anywhere! Dual Speaker Connection: Take your sound to the next level by pairing two speakers together using TWS technology for an immersive listening experience. Ultimate Play-Time: The speaker utilize external battery pa