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Feature: There are 4 pins out of the module: VCC , Trig(control side), Echo(receiver),out (empty) GND .So it's a very easy interface for controller to use it ranging. The all process is : pull the Trig pin to high level for more than 10us impulse , the module start ranging ; finish ranging , If you find an object in front , Echo pin will be high level , and based on the different distance,it will take the different duration of high level. So we can calculated the distance easily: The test distance = (Duration of high level * speed of sound (340M/S))/2 Module details: Voltage: DC5V; Static current: Less than 2mA; Output signal: Electric frequency signal, high level 5V, low level 0V; Sensor angle: Not more than 15 degrees; Detection distance: 2cm-450cm; High precision: Up to 0.3cm; Package includes: 5* HC-SR04 Ultrasonic Distance Sensor 1*HC-SR04 Bracket 1*Male to Femal jump wires 20pin 10*cable ties for fixing HC-SR04