SelfSet Wall Clock is programmed to automatically set itself to Daylight Savings without the use of a signal. Clock has quartz movement with extremely accurate time within minutes per year. Design includes a white dial with black Arabic numerals, black hour & minute hands, red second hand & shatter-resistant, UV-protected clear crystal. "Old schedule, " “new schedule” & “Off” switch allows you to revert to former schedules compliant with 2007 Daylight Savings regulations. Ideal for use in facilities where a radio signal may not reach radio-controlled clocks. Battery-operated movement uses one AA battery (not included). Clock includes hanging hardware. Plastic clock frames will biodegrade within an average of two years in a landfill environment (reference ASTM D 5511). Clock bodies contain 30 percent post-consumer recycled material.