The HSCR04 uses sonar technology to determine the distance to an object. A "PING" is sent out and the returning "ECHO" is used to determine the distince of the object.
SPECIFICATIONS:
Power Supply :+5V DC
Quiescent Current : <2mA
Working Current: 15mA
Effectual Angle: <15°
Ranging Distance : 2cm – 400 cm/1″ – 13ft
Resolution : 0.3 cm
Measuring Angle: 30 degree
Trigger Input Pulse width: 10uS
Dimension: 45mm x 20mm x 15mm