Available on Request Sain Store Sain Store Ultrasonic Module Distance Sensor, HC-SR04, 5VDC Using IO trigger for at least 10us high level signalModule automatically sends eight 40 kHz and detect whether there is a pulse signal backIF the signal back, through high level , time of high output... Available on Request Quick view Qty in Cart: 0 Price: Out of Stock Subtotal: Available on Request