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1.Weight: 5g 2. Working voltage: For DC 4-6V 3. Adopt LM393 main chip 4. Electric condenser microphone 5. Features single channel signal output 6. Low level output signal used for sound control light 7. Great module for sound alarm system. Interface Definition: 1. AO: Analog output sensor 2. GND: Ground 3. VCC: Power supply input range: 3V-24V. 4. DO: Digital output (comparator output) 5. Two red LED indication: power and sensor. 6. POWER: Power is off. 7.SENSOR: When the microphone senses sound reaches a certain value, this LED light.