Kidde smoke alarms use ionisation / photoelectric mechanism to quickly sense smoke, as well as fast-moving and small smouldering fires, and trigger an 85 dB alarm to warn workers. They are ideal for applications in storage facilities, warehouses, industrial workplaces and commercial buildings. These Kidde alarms feature a test button, a large mounting base, a tamper-proof battery locking pin, low-battery warning mechanism and a red LED power indicator light. They can easily operate at temperatures ranging from 40 to 100 degrees Fahrenheit and are available in 10-year battery-powered, battery-operated, and hardwired AC operated variants.