The Key-Mate features a high-intensity LED, available in white, blue or green, that lasts up to 100,000 hours. Four high-capacity alkaline button cells enable the light to run longer - up to 96 hours - and stay brighter than any other button cell keychain LED light. Built of machined aircraft aluminum, the Key-Mate has an anodized finish, available in black or Titanium, to protect it from corrosion damage.