A) Product weight: 8 grams B) use voltage: DC5V 2. quiescent current: less than 2mA C) Level output: high 5V D) Level output: low 0V E) Induction angle: not more than 15 degrees F) Detection distance: 2cm-450cm G) High precision: up to 3mm H) Wiring, VCC, trig (control), echo (receive), GND ground The usage of this product: a control port made a 10US above the high level, you can wait at the receiving port high output. The value of this time, for the time of the distance, only to calculate the distance. Such a constant cycle of measurement, you can achieve the value of your mobile measurement Working principle: Using IO trigger range, to at least 10us high signal; Module automatically send 8 pieces 40khz square wave, automatically detect whether there is a signal to return; There is a signal to return, through the IO output a high level, high time is the duration of ultrasound from the launch to the return time.