Quartz clock accuracy;No ink ribbon required. Clear imprint with carbonless paper;Designed for maximum protection against possible handling;Requires no regular winding;Easy operation;Lightweight and easy to carry;Restricts access to record tape and time by use of a master key;Documents opening and closing of recorder with "0" imprint on tape;Battery indicator light;99 station keys available;Self-contained dry cell battery provides months of maintenance-free operation;Allows registration of each watchman's ID prior to each patrol route;Lock box available to prevent loss of station keys;Time Synchronization: Time synchronization with atomic time from NIST at least one per day;Time deviation: Less than 4/10th seconds deviation per day;Compatible with Microsoft Vista;Built-in battery, when fully charged, will maintain normal operations for 62 hours, or 400 prints, or maintain time and date for 7 days