COB LED technology = Chip On Board - Looks like a lighting panel with multi LED lights packaged together - On/off switch on the side - Use the clip on the back to attach to the brim of your hat - Or, use the clip to attach to a strap, belt, etc. - Adjustable light angle - Battery inserted and separated by plastic pull tab - Hat not included . 2.25" W x 0.5" H. Price includes a one colour/one position imprint. Imprint Area is 0.75" H x 1.25" W on Top centered. Call for multi-colour or multi-position imprints plus the availability of rush delivery.