Abstract: A shaving unit and/or electric shaver having a lighting module for providing an optical heating function at a skin-contacting surface of the shaving unit. At least one aspect of the invention related to an optical arrangement for processing a visible light output for modifying a visible light profile provided at a light output surface, the visible light for providing a visual indicator of activation of the lighting module.

Abstract: A system comprises a first container (2) holding liquid (9) and a second container (4) holding a shaving unit (1) in the liquid (9). A pump (3) pumps the liquid (9) from the first container (2) into the second container (4). A drain (5) enables the liquid (9) to flow from the second container (4) back to the first container (2). A pump driver (6) supplies power to the pump (3) during active periods (Ta) of a cleaning cycle (Tt). A sensor (7) senses the power. A controller (8) detects a disruption in the flow of the liquid (9) by detecting that sensed information (Ab) deviates more than a threshold value (At) from nominal information (An). The nominal sensed information (An) occurs when there is no disruption in the flow of the liquid (9) through the pump (3) during the active periods (Ta).The threshold value (At) is in a range of 0.05 to 0.