Specifications:The working voltage: 3.3V-5VThe output format: DO digital switching outputs (0 and 1) and AO analog voltage outputComparator: wide voltage LM393Length: 4.5cm / 1.77inWeight: 4gWiring instructions:Product wiring description:VCC: 3.3-5V power supply "+"GND: power supply "-"DO: TTL switch signal output.AO: analog signal output (voltage signal)Instructions for use:1. the flame sensor is most sensitive to flame, for ordinary light, it is also responsive , generally used as a flame alarm purposes.2. the output interface can be directly connected to the micro-controller IO port.3. The sensor must be kept at a distance from the flame to avoid damage to the sensor.lighter flame test distance of 80cm, for the greater flame, the farther the distance test4. Analog output and the AD conversion process, can achieve higher accuracy5. When the sensor detects a flame, sunlight, or infrared light, if achieve potentiometer setting threshold, the green indicator light will ON, the DO output low level (0-0.1 - V), the green light is OFF, the DO output about 3 V high voltage levelPackage included:5 x IR Flame Sensor Module