The ELK-319HRR is a Supervised, Wireless Heat Sensor. It uses a solid-state thermistor to sample and trigger an event at a selectable setpoint of either 135 or 200 degrees F. It can also trigger an event if the temperature rises 12 degrees F or more during a one (1) minute time period. This sensor is compatible with Elk’s 319MHz Receivers/Panels as well as many other panels that operate on the 319.5MH z Frequency and adhere to the ITI/Interlogix protocol.