Bulb Type: large Lens 10mm White LED, Lifetime of LED (100,000 Hours)
DC-DC circuit maintains light output throughout battery life.
Switch type: No Switch, twist head to turn on and off. Simple design means
Battery Type: 1x 1.5v common AAA Battery (included)
Product size: about 3.5" x 3/4"
Weight: about 1.4oz w/ battery.
Comes with removable keychain split ring attachment.