This beautifully styled Lamp is very bright and convenient to use. It has eight brilliant UVA LEDs that illuminate the perfect sized area for hand inspection. Turn the knob all the way in to activate, and twist it back out about a quarter turn to deactivate. Lamp will run for several hours on a single battery (included) and the LEDs shouldn't wear out under normal usage. The SpotShooter 8 clip on the back is used to fasten the lamp into the GlitterBuddy fold-up disclosure center. This clip can also be used on a strap or pocket, and it includes a hole for attachment of the included lanyard. Lamp contains one Lithium 123 battery.