Features advanced digital bluetooth which allows the user to play music up to 30m away from a smartphone, computer or tablet. Lightweight, high strength design includes a reinforced roll cage for protection from abusive jobsite conditions. Built-in charger function allows for quick, convenient charging of any M18 battery or electronic devices via USB port. Premium speaker and 40W amplifier produce rich, full sound. Powered by a Milwaukee M18 battery or 230V mains supply. For Indoor & Outdoor Use Mains or Battery-Powered (Includes Plug but No Battery) Playback via Bluetooth / Aux Input Dual Speakers Drop Impact-Resistant LED Display for Power, Duration & Clock For Indoor & Outdoor Use Mains or Battery-Powered (Includes Plug but No Battery) Playback via Bluetooth / Aux Input Dual Speakers Drop Impact-Resistant LED Display for Power, Duration & Clock