Flicker adjustment: white cross screw, Must use combined with dimmer power supply Active only two-wire connection - no neutral required. Switching on changeover possible in combination with a chaniver switch Soft start, minimum to maximum brightness delay is about 3 seconds.Premium quality with CE certificates Long lifespan Noiseless Insulation protection Safety Built-in protection against overload, short circuit, over current, over temperature .. Electronic protection against short circuit with permanent shutdown after 7 seconds on the laster; Electronic overheat protection, 120 off, automatically opens below 120 Flashing light of the connected lamps due to exceeding the specified minimum load or centralized impulses from the control units. This does not represent any defect of the device.