Guru Nanak Industries manufactures Guard Monitoring System. Guru Nanak Industries is an ISO 9001:2000 certified company that manufactures window accessories and related products. The Guard Monitoring System is a device, which is programmed to know the on-duty time of the guard. In this system, the guard has to press a button after 15 to 30 minutes to make sure he is on duty. This dual powered system works on 220 V AC mains as well as low voltage re-chargeable battery.