This TSTAK (R) Portable Bluetooth (R) Radio plus Charger provides premium sound with a bass resonator and Bluetooth (R) connectivity. It's jobsite tough, featuring IP54 water and dust resistance. A convenient phone storage compartment protects your device. A fast USB charging outlet and Aux audio output provide added convenience. This unit runs on and charges 12-Volt MAX, 20-Volt MAX, and 60-Volt MAX batteries, including FLEXVOLT (R) Stack it with all other TSTAK (R) boxes in your system. This is the perfect upgrade to your jobsite storage.