Experience instant illumination with the Princeton Tec Pulsar light that's so compact it easily fits in your pocket. Just slightly larger than a quarter and weighing in at only 7 grams, it's the perfect light source for key chains, backpacks, belt clips, tents, emergency situations and more. The wide-beam, ultrabright LED provides smooth, white light in any close to midrange situation, and only requires two 2016 lithium coin-cell batteries. Runtime: Up to 12 hours. Available: White LED. Colors: Black, Blue, Neon Yellow.