The MIDI mouse from TECH-21 is quickly explained. A small Midi switcher in pocket format. On the front, there is an Up/Down button, an Activ/Search button and a large LED display that is easy to read even on the darkest stage. The target preset can be selected without cutting the active programme. Only pressing the Active/Search button activates the new programme. The Midi Mouse can be powered either by an external power supply unit, by phantom power via a Midi cable or by a 9V battery. If the Midi Mouse is battery-powered, the display goes into "sleep" mode after a longer period of non-use to avoid unnecessary battery drain. The slightest press of one of the three switches immediately puts the display back into operation.