Specification:
Voltage: DC 5V
The static current: less than 2mA
Level of output: high 5V, low 0V
Sensor angle: less than 15 degrees
Detection distance: 2cm-450cm
Precision: up to 3mm
Weight: about 8.4g
Size: 45*20*15mm/1.77*0.78*0.59in
Connection:
VCC, trig(control end), echo(receive terminal), GND(Connect to Ground)

Working principle:
1. Adapting IO trigger range, at least 10 us high level signal.
2. Module automatically sent eight 40 KHZ square wave, automatically detect whether there is signal to return.
3. Have signal returned, output high level through the IO, the duration of the high level is Ultrasonic from launch to return time. Test distance = (high level of time * sound velocity (340 m/S)) / 2.

Package included:
10pcs ultrasonic measuring sensor module