Product details:

Set this Sharp atomic clock on your bedside table or hang it on the wall so you always have access to the most accurate information. The attractive digital display shows the time, date, indoor temperature and outdoor temperature with large numbers, so you know how to plan for the day. To receive accurate outdoor temperature readings, place the wireless gauge anywhere within 100 feet of the indoor receiver for an accurate reading. Plus, when daylight savings time rolls around your clock will automatically update with the correct time, so you never worry about setting your clock. Battery Operated for Accuracy Battery operation ensures that you never have to worry about accuracy during a power outage. This Sharp atomic clock receives daily updates of the time via the US Government's WWVB radio broadcast from the National Institute in Fort Collins, Colorado for optimal accuracy. Does this clock use batteries This Sharp atomic clock uses three AA batteries in the main unit and two AA batteries in the outdoor sensor (batteries not included).