Honeywell’s wireless fixed-heat and rate-of-rise temperature sensors offer expanded fire detection and installation flexibility. Easy to install with no wires to run, they are ideal for hard-to-wire locations and applications that require more than smoke detection. Specific models contain a built-in fixed-temperature sensor, which will signal an alarm if the environmental temperature rises above 135°F. Others incorporate an additional rate-of-rise temperature sensor. The rate-of-rise thermostat model senses the rise in temperature and signals an alarm if the increase is 15°F or more per minute..