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HiLetgo 2pcs 801S Vibration Sensor Module Vibration Model Analog Output Adjustable Sensitivity Features: Size: 30mm x 20mm x 10mm The main chip: LM393, vibrating probe Operating Voltage: DC 3-5V Has a signal output instructions; With a TTL level signal and the analog output signal; Output valid signal is high, the light goes out; Adjustable sensitivity (fine-tuning); Vibration detection range, no direction; With mounting hole, the firmware installation flexible and convenient. Package Includes: 2 * 801S Vibration Sensor Module