Arduino Compatible Dual Ultrasonic Sensor Module.

The popular HC-SR04 ultrasonic distance module provides an easy way for your DuinoTECH to measure distances up to 4.5m. Use it to add obstacle avoidance to your next robotics project or mount it on a servo to create your own ultrasonic SONAR! •    Uses just two digital pins•    Operating Voltage: 5V•    Sensor Angle: <15 degrees•    Detection Distance: 2cm – 450cm•    Dimensions: 45(W) x 20(D) x 13(H)mm  For More info on Arduino.