The Kidde HD135F Interconnected 120V AC Wire-in Heat Detector Alarm is a reliable home safety device designed to detect rapid increases in temperature, making it ideal for protecting residential properties. With a fixed temperature heat detection type, this alarm provides peace of mind knowing that it will quickly alert you in case of a fire. Compatible with Kidde Firex models, this heat detector is a crucial component in any home safety system, ensuring the well-being of you and your family.