Trintec Massive 14" Aviation Classic Altimeter Wall Clock 9060-14 Aviatrix Injection molded from high impact styrene and features a plastic lens. This product comes with a one year warranty. We use a high quality American made Quartz clock movement for accuracy which will provide many years of reliable service. Dimensions: 14" Diameter For best performance please use a high quality Alkaline battery. One "AA" alkaline battery required.