Super tiny small and light, adds no bulk to key chain,you will never notice the bulk of other flashlights. Long Lasting and Incredibly Bright Light: Usable light up to 12 hours of use and can be seen from up to a mile away at night. Tough and Durable: Drop resistant, water resistant and almost unbreakable LED which lasts for 100,000 hours.

https://www.amazon.com/Keychain-Flashlight-Waterproof-Emergency-aluminium/dp/B07TCXDPPP