Made of high-impact polycarbonate. Two A-76 1.5 volt batteries are included. Shock-resistant, light emitting diode, never needs replacement. The improved Patented line lock provides for better line grip. Visibility up to 200 feet. New light diffusion pattern for better visibility. Lighted float can be used for marking trot lines. Float can be removed without cutting line, removing bait, hook or sinker. Allows line to slip freely when used as slip floater. Locks line securely when used as fixed float. Use for night and day fishing.