This Convenient Trolley Speaker Is Ideal For Parties Outdoor .high Capacity Built-in Battery Lasts Up To 8 Hours. With Bluetooth Technology, You Can Connect It With Hundreds Of Devices Like Iphone Or Samsung Phones.portable Speaker System 12″ Woofer 5″ Tweeter1 Mikeoutput Power:400w Rmsbuilt-in 11.1v 4400mah Lithium Rechargeable Batteryfm Radio Functionusb And Sd Card Slotmp3 Player With Led Displaybuilt-in Trolleydual Charging Option/power Source(a) Dc 12v (car Battery)(b) Ac 220 To 240v 50/60 Hz