Makeblock Me Ultrasonic Sensor V3.0 Comes with Arduino library for easy programing Over-current protection.Easy wiring with 6 Pin RJ25 interface Labeled with yellow tag and compatible with Me Base Shield and Me Baseboard 2.54mm breakout pins for connecting with jumper wires 16mm interval M4 mounting holes, compatible with Makeblock beams.on board indicator LEDs for debugging and feedback