2-wire Conventional Heat Detector Heat Alarm Sensor The device is intelligent sensors that utilize a state-of-the-art thermistor sensing circuit for fast response. Features and Benefits 1.Compatible with all the conventional fire alarm control panel 2.Unpolarized wire input 3. Wide range of operating voltages 4. High precision electronic thermistor 5. Built in microprocessor intelligent software 6. wo LEDs blink standby , provide 360° visibility 7. Insect-resistant s creening 8. Twist-on mounting base with tamper lock 9. Remote Indicator LED can be connected. Specifications Installation Temperatures: 14°F to 122°F (-10°C to50°C) Operating Humidity Range: 10% to 93% Relative Humidity Non-condensing Operating Voltage Range: 16 to 32VDC Volts Non-polarized Standby Current: 40µA @ 24 VDC Maximum Alarm Current (LED on: ) �30mA @ 24 VDC Fixed Temperature Rating: 135°F (57°C) Height: 2.2� (55 mm) installed in Base Diameter: 4.0� (103 mm) Weight: 5.5 oz. (155 g)