The Gamma Ray LED key chain will project light up to 30 feet and be seen up to 1 mile away. Super Bright LED lights available in Blue, Red, Green and White. Each light has 20 hours of continuous use with Lithium battery (included). This weatherproof can be used as a keyring and is suitable for indoor and outdoor use. Gamma Ray LED Light Keychain PRODUCT: ST-KYLT $10.95