Keep an eye on the time in the backyard or in your living room with its easy-to-read face day or night. Durable construction with weather sealing ensures long life indoors or outdoors. The clock operation requires one AA alkaline battery with 4 D size batteries to power the lighted dial. The optional off switch can turn off the auto-lighted dial to conserve battery power. A stylish conversation piece with an earthly charm and modern utility from the world leader in atomic time and weather instruments.