Easy to use At each check point, your security guard takes the station numbered key out of the station box, inserts it into the recorder and turns it clockwise to record checking time. This produces hardcopy report which includes the station number, date, hour and minute for each check point. Secure To maintain the integrity of the patrol record, access to the record tape and time adjustment can be achieved only with use of a master key. Thus, whenever the record is opened with master key, the letter "k" will appear on the tape. Every time the recorder is opened or closed, a small "o" will appear on the tape to denote the time and place that the recorder was opened. As an added security measure, those companies who rotate patrol courses can require that each watchman register his or her I.D. number on the record tape at the beginning of each patrol route. Package price include: (1) PR-600 Clock (1) 1.5 Volt Battery (1) Box of termal Paper Tape (1) Master "K" Key (15) Station Keys w/chain (Key Numbers 1-15 ONLY) (15) Station Boxes with lock (1) Shoulder Strap (1) manual Inclusive of installation test and commission of system.