Using the same technology NASA employs to tell time, 1500E time clock wirelessly synchronizes with the National Institute of Standards & Technology's (NIST) atomic clock in Boulder, Colorado. In addition to confirming the time daily, the 1500E automatically adjusts for Daylight Saving Time. No wires, no worries, & no more excuses for being late. As a time clock, the 1500E records employees' in & out times for payroll accounting. As a job clock, it can track project time for accurate costing. And as a document stamp, the 1500E can print the date, time & preset messages on important documents. Case is made of plastic.