Gearank

From the manufacturer:

If you're a musician who's on the move, our BP25 is the best amp for you. Whether you’re running to a rehearsal, lesson, street gig, or any situation that requires portability and versatility, the BP25 is a battery-powered marvel that's ready to travel fast. The amplifier sounds amazing and is capable of high-volume output thanks to dual digital power amps and a pair of high-performance speakers. And just wait until you hear the built-in effects and amp models!

Coolmusic BP25 amps are famous for performance that exceeds their physical size, and the amp is no exception. With two high performance neodymium speakers onboard, this amp sounds incredible, and is capable of high-volume output that defies its physical dimensions. Jam along with your favorite songs by connecting an external CD MP3 player or bluetooth to the Line In jack, also can connecting to bluetooth device through your phone or ipad.Best of all, it can run for up to 8 hours on lithium battery.