The AT-4500 Calculating time clock will add up regular and overtime hours worked right on employee's time card; it accommodates up to 50-employees. TOUCH FREE Operation - there are no buttons for the employee to push when clocking in or out; running daily and pay period totals are displayed on the card for quick reference. This employee punch clock can be used with any pay cycle (weekly, bi-weekly, semi-monthly or monthly). Features of the time clock include: quick and easy setup with guided menu, large display, automatic card feed and more. With the latest generation of intuitive programming, this complete kit includes the clock, instruction manual, ribbon (installed,) starter pack of timecards, 2-keys and a time card racks. Print as well as Display formats can be set to employer's preference with options for regular time (AM/PM) or Military format (0-24.) Minutes can be displayed in either normal (0-60) or hundredths of hour (0-100) for those who find this setting to be best for calculating pay rate. IMPORTANT: Please use AT-4500 time cards, Amazon Listing http://www.amazon.com/gp/product/B01CKJN61S and AT-4500 Ribbons Amazon Listing https://www.amazon.com/dp/B01N7L795C. NOTE: if your company has 24/7 operations with overlapping shifts between two work days this clock will not fit your needs. The clock must advance to the next workday without any employees 'on the clock'.