Automatically calculates time for up to 100 employees with atomic clock accuracy. The large electronic display shows the current time to let staff members know when they should clock in. Works for pay periods or in job mode. A simple design makes this device easy for all your employees to use. Calculates actual or rounded time and supports automatic break deduction. Features automatic print alignment and sensing of front and back of cards. This Lathem atomic time clock is ideal for use in small-scale manufacturing facilities, satellite warehouses, and other similar business settings. Internal lithium battery maintains time, card totals and program settings for up to 3 years without power; optional rechargeable battery keeps unit fully usable up to 24 hours in event of power failure.