The RECORDING Lamp USB is a small plexiglass light unit which indicates Recording start/stop and record "ready". The new hardware allows customisation of all lamp signals: Recording (usually red) and Record Ready (usually yellow), Visual Metronome, and Cue can each be a separate colour. The plexiglass design and matt finish provide an interesting light effect. The unit is powered directly from USB. No PSU or Midi Interface is needed !