POWER FLEXIBILITY: IN-VEHICLE Alpine ICE gives you the flexibility of using the most convenient power sources such as from a vehicle or an external battery so that you’re not reliant on an internal battery with a short lifespan. Alpine ICE can also auto-detect the vehicle's low battery so the vehicle can restart and charge when started.POWER FLEXIBILITY: ON-THE-GOEnjoy Alpine ICE while camping, at the beach or at a barbeque using a (optional) Goal Zero Yeti 400 external power source and (optional) Mighty Max Plus One Sports Cart system. Alpine ICE is also compatible with other 12 volt power sources capable of 15 Amps. BRING THE PARTY TO LIFE IN SECONDS Don’t be tied down. Get your sound up and running quickly through the extremely simple Bluetooth® wireless connectivity and with it’s impressive range you can easily control the music with your Bluetooth enabled device from up to 30’ (feet). Along with Bluetooth, the AUX-in jack gives you the flexibility to connect to your music, anywhere.