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The photosensitive resistor module most sensitive to ambient light, generally used to detect the brightness of the ambient light, triggering microcontroller or relay modules; The comparator output signal is clean, good waveform, driving ability, more than 15mA. The output form: DO digital switching outputs (0 and 1) and AO analog voltage output A fixed bolt holes for easy installation With adjustable potentiometer to adjust the brightness of the light detection