Our 14" Classic Altimeter Wall Clocks are made to simulate as closely as possible a primary flight instrument. Each Clock dial closely represents that of a the particular flight instrument. Features: Injection molded from high impact styrene and features a plastic lens. We use a high quality American made Quartz clock movement for accuracy which will provide many years of reliable service. For best performance please use a high quality Alkaline battery. One "AA" alkaline battery required. This product comes with a one year warranty. Dimensions: 14" Diameter