The Royal CS300 employee time clock makes recording simple and affordable. You can make your recording the most accurate possible with the atomic employee time clock, which is synchronized by the radio signal from the U.S atomic time in Boulder, Colorado. You just set the correct zone and the atomic employee time clock will automatically set itself. The internal calendar set itself for leap year, number of days to a month and day light saving. Detailed information is available on our web site at www.royal.com.