The ROLAND BA-330 is a portable PA system that can run on batteries. It has 6 input channels and can connect to microphones, keyboards, and other line-level equipment, as well as guitars. It also features reverb, making it ideal for speech events and street performances. Operation confirmed (OK) It can run on batteries, and an AC adapter is also included. There is a scratch above the ROLAND logo on the front, but it does not affect its use.