This is a Flame Detection Sensor Module board is sensitive to the flame, but also can detect ordinary light. Usually used as a flame alarm. Detects a flame or a light source of a wavelength in the range of 760nm-1100 nm. Detection point of about 60 degrees, particularly sensitive to the flame spectrum. Sensitivity is adjustable, stable performance.Specifications:Sensitivity: Wavelengths between 760 nm to 1100 nm infrared is most sensitiveDetection: 60 degree detection sensorWorking voltage: DC 3V - 5.5V