DIY 1-Way Sound Sensor Module for Arduino
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http://dx.com/p/diy-1-way-sound-sensor-module-for-arduino-blue-150778
Features
Sensitivity adjustable, Operation voltage: 3.3V-5V, digital on-off output, with fixed screw hole for easy installation
Application
Detecting the surrounding sound intensity, not available for detecting sound loudness or sound of specific frequency