OUTPUT LED The yellow LED ON indicates the active output status.DISPLAY (green-coloured 4-digit display)During normal functioning, the display indicates a value relative to the quantity of light diffused by the target.Please refer to the SETTING paragraph for the correct indications to follow during the acquisition or setting phase.STABILITY LED (S)The green LED ON indicates that the output is ON or OFF in a stable manner.DELAY ON LED (1)The green LED ON indicates the DELAY function activation at the ON output status.DELAY OFF LED (2)The green LED ON indicates the DELAY function activation at the OFF output status.+/- and SET push-buttons Please refer to the SETTING paragraph for the correct indications to follow during the acquisition or setting phase.