This durable aluminum keylight provides ample imprint area, while the flatter profile makes it easy to slip into your pocket. This item's 3 LED lights are powered by 4 LR41 button batteries.3 LED aluminum keylight. Sturdy metal keylight with 3 LED bulbs and full on/off button. Nice decoration area on the side opposite of the button. 3 bulb flashlight head powered by 4 LR41 button batteries, included. Dimensions: 21/4 H x 7/8W x 1/4 D plus keychain.