The Lutron Skylark SELV-300P-GR is a 300W single-pole preset electronic low-voltage dimmer rated at 120V, suited for residential and commercial installations controlling ELV transformer-based lighting loads. A rocker on/off switch returns the light to the preset level stored by the slider, with slide-up-to-brighten and slide-down-to-dim operation; the unit is 100% factory tested for reliable field performance. Gray finish; coordinating Claro and Stainless Steel wall plates are sold separately.