ELEGRP Toggle Dimmer Switch for Dimmable LED, CFL and Incandescent Bulbs, Single Pole/3-Way, with Wall Plate, White (6-Pack) DM101S-WH6 - The Home Depot
ELEGRP Digital Dimmer Light Switch for 300W Dimmable LED/CFL Lights and 600W Incandescent/Halogen, Single Pole/3-Way LED Slide Dimmer Light Switch, Wall Plate Included, UL Listed, 1 Pack, Matte Black - Amazon.com
3 Way Switch Wiring Made Easy, applies to 4-Way Switches and dimmer switches. - YouTube