Architect Swing Arm Desk Lamp with Interchangeable Clamp-on Base (Black) Adjustable architect swing arm desk lamp with an interchangeable clamp-on base Can be placed on any flat surface or clipped to a desk, table, or countertop Designed for use with a 40 watt medium base type A bulb Includes a flip on/off switch on the cord Rotary on/off switch on shade