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ISD1820 3 5V Voice Module Recording And Playback Module with Microphone and 0.5W Speaker MQ 2 Gas Sensor Module For H2 one potentiometer's resistance changes proportionally one potentiometer's resistance changes proportionally 0 BLE connectivity in a single module eliminates the need for separate radio components Security & Alarm Systems: Record a warning message or siren sound that plays when a PIR motion sensor or door sensor is triggered PLAYL Interface Pins REC
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