The COB LED Dimmable Switch is great for closets, cabinets, work-light, garage, trunk light, lockers, and so much more. Use the knob to adjust the brightness - it outputs 200 lumens max. Requires 3 AAA Batteries - included and has three ways to install - magnets, hanging hole, and adhesive strips. The COB LED switch comes packaged in countertop display, and it contains 12 - COB LED Dimmable switch individually packaged in blister packs. It is approximately 4.50" x 3" x 0.75" in size and comes in assorted colors blue and pink.