Sound Sensors and Microphone

HC-SR04 Ultrasonic Ranging Sensor
SKU: 1072

Sound Sensor Module
SKU: 2105

37 Sensors Kit V2.0 (great for Arduino or Raspberry Pi)
SKU: 2871

HC-SR04 Ultrasonic Sensor Holder/Mount (Blue)
SKU: 1348

SparkFun Sound Detector
SKU: 1319

SparkFun Electret Microphone Breakout
SKU: 2338