Universal dimmer switch with automatic lamp detection. Standby loss is only 0.1 watts. Minimum or maximum brightness and dimming speed are adjustable. Equipped with a children's room and snooze function. The dimmer switch is dependent on ventilation conditions and supports dimmable energy-saving lamps as well as dimmable 230V LED lamps, depending on the lamp electronics. The switching occurs at zero crossing with soft on and soft off for lamp protection. There is a universal control voltage that is galvanically isolated from the supply and switching voltage. No minimum load is required. Short control commands turn the light on or off, while continuous control adjusts the brightness to the maximum value. Interrupting the control changes the dimming direction. The set brightness level is saved when switched off. In the event of a power failure, the switching position and brightness level are saved and may be turned on again when the supply voltage returns. From 110V control voltage, the glow lamp current is 5mA. An automatic electronic overload protection and over-temperature shutdown are also included.