Electronic soap dispenser for wall mounting within a service room, with opto-electronic control. Product consists of a container for liquid soap, a power supply and pump unit with 4 adjustable soap output volumes per sensor trigger. Sensor in all-metal housing with a nickel-coated brushed surface. Mains-operated with power supply unit 230V AC including the option to connect an emergency back-up battery in case of mains supply failure or for off-grid operation with external 6V DC battery (4 x AA, not included in scope of delivery). Power supply, tank and pump can be wall mounted either underneath the basin or within a service room.