HC SR04 Ultrasonic, Sensing Distance: 3 - 4 Mm

The HC SR04 Ultrasonic has a high sensitivity of detecting non-contact presence. It transmits short burst of ultrasonic sound towards the target of interest that eventually reflects the sound back to the sensors.Features:• Measures the time for the echo to return to the sensor• Valuates the distance of the target using the speed of the sound in the medium• High sensitivity and high sound pressure• Ultra Sonic sensor module