Brown SPT-2hi-low feed-thru dimmer line switch that is rated 200W - 120V and switch any bulb (3-way or not) from "off" position go low bright, high bright, then off. This only works with the thicker SPT-2 cord. Some simple assembly required. It has to be attached to cord. Wecombine with other items to save shipping costs. $2.92 each. Shipping is $2.40 plus $.12 for each additional piece. Combined shipping- to get cheapest shipping costs (when buying different items)please buy what you need and “request invoice” so we can send invoice with lower shipping costs."How to Request Invoice when using shopping cart"---From your eCRATER cart, near the top of the page, move your mouse curser over our name “lamppartsguy” and a drop down menu will appear with the option to request invoice from seller.