Compatible with: DeWALT 20v Max including 20-60v Flexvolt Batteries. Simply connect your battery to experience superior stereo sound! Our primary focus is on low-voltage protection. To prevent overload damage, the speaker will automatically power off if the battery voltage drops below 15.5v. Versatility: Speaker is functional with Bluetooth and USB Audio Disk. Bluetooth 5.3 ensures rapid & stable pairing with your devices. Strong connection is guaranteed up to 52 ft. For USB music playing, simply plug-in the USB disk into the USB port to enjoy the pure crispy sound! TWS Function: The speaker support dual speaker connection which enable two Bluetooth speakers to be connected simultaneously with one Bluetooth device. Lets create different atmosphere and full of enjoyment! Whether in your workshop, campsite or anywhere you need it for! Delicate Size Contains Infinite Energy: Dont underestimate the speaker from its size. It liberates deep, rich and clear sound with zero distortion