Ltpgtvarilight v pro series classic white plastic 4 gang quad 1 or 2 way 4x250 watt push onpush off trailing edge dimmer with white knobs eliminate dimmer buzz for gls bulbs gu10 lamps and lv transformers including trailing edge loadsltpgtltpgtthe v pro series dimmer has soft start technology allowing a longer life span of the bulbs or lamps used by increasing the brightness level softly which also creates a welcoming effectampnbspltbr gtltbr gtthe v pro se