The ELK-6052 Wireless Smoke & Heat Detector is designed for use with Elk's two-way wireless product line consisting of the ELK-M1XRFTWM Transceiver and the ELK-M1 Control. It is intended for residential applications and incorporates many features designed to ensure its reliable performance. This smoke detector provides a two-way solution with built-in sounder and wireless "Sound All" activation during an alarm. The unit utilizes photoelectric smoke detection technology, and includes fixed temperature 135°F heat detection, and rapid "rate-of-rise" temperature detection. Built-in self-diagnostics monitor sensitivity and operation status.