When it comes to miniature lighting, the Nite Ize Radiant Microlight LED is an excellent choice. With advanced engineering and real-world design, this light offers the power of an LED lamp on a device small enough to fit on a keychain. Powered by a pair of lithium coin cell batteries, this tiny light is incredibly powerful, with signal visibility from up to a mile away and an effective range of almost 50 feet. It features four lighting settings that can be toggled between with a multi-function switch, including high power, low power, strobe, and signal modes. The durable polycarbonate body is resistant to both water and crushing, ensuring that this light will be by your side for a long time to come. The stainless-steel universal clip allows it to easily attach to zippers, keys, backpacks, utility belts, and many other convenient locations. Runs up to 22 hours, with an automatic shutoff built into the high mode in order to preserve battery life.