Our clock has battery-powered LED lights, controlled by a light sensor, that go on at dusk and shut off at dawn. The hour and minute hands, as well as the thermometer and hygrometer, are all readable at night. The glass lens and the movement cover are fully gasketed, making the clock weatherproof under any condition. A metal case in a bronze finish protects the instruments. One (1) AA battery is required for the Quartz movement, and four (4) D batteries are required for the LED lights. The batteries are not included.