Features: Can detect a flame or the light of 760~ 1100nm wavelength, lighter flame test distance of 80cm, for the greater flame, the farther the distance test. The detection angle is about 60 degrees, particularly sensitive to the flame spectrum. Sensitivity is adjustable (shown in blue digital potentiometer adjustment). Comparator output, signal clean, good waveform, strong driving ability, more than 15mA. With adjustable precision potentiometer for sensitivity adjustment. With fixed bolt holes for easy installation. Specifications: The working voltage: 3.3V-5V The output format: DO digital switching outputs (0 and 1) and AO analog voltage output Comparator: wide voltage LM393 Length: 4.5cm / 1.77in Weight: 4g Wiring instructions: Product wiring 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 test 4. Analog output and the AD conversion process, can achieve higher accuracy 5. 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 level Package included: 5 x IR Flame Sensor Module