No wires, no worries & no more excuses for being late. Tru-Align feature ensures a perfect punch every time on special E16 time cards (sold separately). The 1600E is truly automatic as it never needs resetting because it automatically changes year, month & date with perpetual calendar until Year 2099. Even changes time automatically for daylight saving time. With a five-year memory backup battery, the 1600E will even keep time & settings during power outages. As a time clock, the 1600E records employees' in & out times for payroll accounting. As a job clock it can track project time for accurate costing. As a document stamp, the 1600E can print the date, time & preset messages on important documents. Print time in AM / PM or 24-hour format. Time Clock Type: Electronic; Number of Employees: Unlimited; Imprint Style: 18 Preset Formats; Display Type: Digital.