Suitable for control of dimmable electronic transformers, toroidal transformers and tungsten lamps WITHOUT de-rating. Not suitable for use with fluorescent lamps. Leading edge phase control. For use with resistive and inductive loads. Hold down for dimming control. Integrated over-temperature protection fuse. Module case ultrasonically sealed to reduce dimmer buzzing. Smooth dimming operation from 0-100% light output. Neon illuminated button to locate in darkness. Fits a plaster depth (16mm) mounting box. Use a 25mm deep mounting box. One way switching only. Complies with the latest Electrical Safety standard for dimmer switches EN 60669-2-1:2000. EMC compliance - EN 55015. 1 Year guarantee. This product available in white finish only.