Some alarm clocks can set multiple alarms. They are commonly used in burglar alarms and automatically-activated lighting systems. PIR sensors are commonly used in security alarms and automatic lighting applications. The facility lacked burglar alarms, or even a fenced perimeter. The police receive a tremendous number of false alarms from burglar alarms. Violations included lack of fire exits, alarms or sprinkler system. From that date, all replacement smoke alarms must be photoelectric. This translates into fewer false alarms and more accurate detection. Kidde is one of America's largest manufacturer of smoke alarms and fire safety products. Many fire alarms in schools, hospitals, stadiums, etc. The watch also has a vibrating motor for silent alarms, and smart notifications. The most common cause of general alarms is fire. They were also hampered by the sound of the fire alarms. This purchase helped propel Simplex to become a leader in fire alarms and business systems. However, unlike mobile phone alarms, they have some limitations.