When the Interlogix SDX-135Z smoke detector is part of your monitored security system, you never have to worry about missing an alarm. It can be used with any Interlogix alarm panel that has a wireless receiver such as an Interlogix NetworX system or the Simon XT or Simon XTi-5.
With a built-in heat and freeze sensor, the SDX-135Z communicates independent of the control panel with via the 319.5 MHz wireless frequency.

What sets the Interlogix SDX-135Z smoke detector apart
Sensor and battery life ensures 10 years of continuous operation
Restorable, built-in, 135F (57C) rate-of-rise heat sensor with additional pre-freeze indication at 41F (5C)
Available simultaneous use as a smoke/heat detector and freeze sensor
Push-to-test capabilities for local device only and/or system initiating test
Self-activation when attached to mounting bracket (included)
Three-year warranty