Time, tide and weather in one handsome packageForged from solid brass, then chrome plated and hand polished. The screw bezel adds the classic nautical look. Provided with complete instructions, mounting hardware, and a fresh battery as required. All instruments carry a limited lifetime warranty. The temperature compensated, aneroid barometer movement is fully adjustable. Inch and millibar scales. Movement is calibrated for altitudes to 3,500' above sea level. The Time and Tide clock averages the Atlantic lunar tide cycle, calibrated for the east coast of the United States only. Uses a AA battery. (Note: The clock will work for other tidal bodies of water but will need to be re-set more frequently.) Mounting hardware and batteries included. Case Material: Chrome-plated solid brass Movement Type: German aneroid barometer; quartz clock Bezel: Screw-down Dial Diameter: 4" Case Depth: 2-7/8" Case Drilled for Mounting: Yes Warranty: Limited lifetime