Ideal for everyday use. With an overall length of only 7.1 cm, the E01 can easily be attached to your key chain or be stored in even the smallest bags. The high-quality Nichia Power white GS LED is powered by a 1.5 AAA battery (included). The high-grade lamp body of aircraft aluminum is hard anodized. Splashproof. Diameter: 14 mm. Weight without battery: 14 g.