Usage Tips:Features: There are 4 pins outside the module: VCC, Trig (control side), (receiver), output (null) GND. So it's a very simple interface for the controller to use its scope. All process is: push Trig pin to high level, module start scope; To complete the range, if you find an object in front of you, the pin will be high level, and based on different distances, it will require different durations of high level. So easily calculate the distance: Test Distance = (High Level Duration x Sound Speed (340M/S))/2 Material:Plastic + Metal colour:As Shown Package Contents: 5 x -SR04 Ultrasonic Distance Sensor 1 x -SR04 Bracket 1 x Male to Femal jump wires 20pin Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.