The endurance II 115 tide and time clock measures 4"(Dial) x 6"(Base) x 3 1/8"(Depth) and weighs 1.25 lbs. Light, strong and durable, the Endurance II Time and Tide Clock in brass finish features a traditional front opening porthole style case that houses a combination quartz time and tide clock movement. The easy-to-read dial displays a standard 12-hour clock face that tracks time to the second while a fourth red hand indicates the current position of the tide. This tide and time clock is constructed of the same high luster, maintenance-free, ultra-hard finish that is a hallmark of the popular Endurance collection. The tide sector averages the Atlantic lunar tide cycle. It will work for other tidal bodies of water but will need to be re-set more frequently. It''s guaranteed not to tarnish or scratch and is weather resistant. Beveled glass crystal. Mounting methods for boat or shore. AA battery included. Lifetime warranty on finish and movement.