Aico 600 Heat Alarm is activated by heat from a fire, not smoke, which makes it ideal for kitchen installations where smoke alarms are prone to nuisance alarms. The thermistor will trigger the alarm when the activation temperature of 58°C is reached. This battery powered alarm contains sealed in, tamper proof lithium battery that will last for the full 10-year life of the alarm. The alarm is not powered until it is twisted on the mounting base, thus avoiding battery power consumption during storage and prior to installation.