*Our megaphone/ bullhorn works with batteries. (batteries not included)Lithium Rechargeable Battery 12V(not included); fast charging and long lasting. The unit charges in 4-6; and lasts for 8 hours of continuous use.Runs on six D-size 1.5V batteries (Â NOT INCLUDED).Can be used continuously and constantly for 6 hours under maximum power usage conditions. Long battery life to meet your needs when going out. *Aux (3.5mm) Input Jack (not included)USB Input for Music ProjectionJust insert your USB card into the unit and you can entertain and inspire your audience with music and recordings downloaded right off your computer. You can also play pre-recorded messages and talk over your music selections.Connect & Stream Audio from External Devices *Amplify your voice:Â Spread your voice clearly and loudly. Great for event management; festivals; carnivals; and many sporting competitions.