The Key Mate is the smallest, but brightest light in the world. The Key-Mate by Streamlight runs longer and stays brighter. The reflector optics delivers up to 400 percent more lighting range than other penlights. Attach the Key-Mate to almost anything with its pocket, gear, key chain clip. You will be amazed at the Key-Mate's range! The Streamlight Key-Mate is a micro miniature weatherproof personal flashlight. Put on in your car, purse, pocket, on your key chain, in the garage, in your backpack, and anywhere else you will need light.