This Flame Sensor Module is used to detect fire/flame source or other light sources of the wave length in the range of 760nm – 1100 nm. It is based on the YG1006 sensor which is a high speed and high sensitive NPN silicon phototransistor. Due to its black epoxy, the sensor is sensitive to infrared radiation. Sensor can be a great addition in a fire fighting robot, it can be used as a robot eyes to find the fire source. When the sensor detects flame the Signal LED will light up and the D0 pin goes LOW. Features: High Photo Sensitivity Fast Response Time Sensitivity adjustable Specification: Working Voltage: 3.3v – 5v Detect Range: 60 degrees On-board LM393 chip Dimension: 3.2cm x 1.4cm.