SunFounder Ultrasonic Module Distance Sensor SF-SR02 for Arduino UNO MEGA R3 Mega2560 Duemilanove Nano Robot Rapsberry Pi 3, 2 & RPi Model B+ XBee ZigBee,2cm-700cm An ultrasonic module with a detecton range of 0.79 inch-275.6 inch; signals detected are stable within 196.85 inch, grow weaker beyond 196.85 inch and at last disappear. Better Than HC-SR04 in Performance. With a power indicator LED so you can tell whether it is powered. Auxiliary 4-pin anti-reverse cable, thus making the wiring tighter and convenient. Operating voltage: 5V; working current: 16mA.