These are some common tools used to work on this device. You might not need every tool for every procedure.
This is a Sony MZ-R700 minidisc, Sony's attempt to provide an alternative to portable CD players, right before the mp3 revolution. Minidiscs were particularly popular in Europe and Asia but the devices didn't catch on as much in North America. This model supports MDLP and was capable of recording up to 4 full-length audio CDs onto one small minidisc (via Sony's proprietary ATRAC format).