Battery Cover
This Rhythm composer/Drum machine was released in 1986 By Roland and was part of the Transistor Rhythm family of composers ,just like its siblings it is becoming very hard to find nowadays with people asking for high prices
They were used in Hip-Hop,House,electronic and Pop genres making them quite versatile like the other member of Roland's TR family
It was also known for being very 707/727 like as it appears to use some of the same digital samples
It can be plugged into the wall or used with battery’s