This Vintage style aviation wall clock is made to simulate as closely as possible a primary flight instrument. Features: This 9060V six inch Vintage Altimeter Clock is injection moulded from high impact styrene and features a real glass lens for durability and scratch resistance. It has 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. Dimensions: 6.5" x 6.5.