This is a Robot model car crash or collision switch sensor module For Arduino, it normally outputs high voltage, but when the sensor is carsh something such as the wall, the on-board switch will be pressed, and the module outputs low. This module can be installed into any mobile platform to achieve collision detection function via 3P sensor cable and Arduino sensor expansion board connector. Its working voltage is 5v which make it compatible with standard Arduino/Crowduino 5V system. It has crowtail interface for plugging onto the Crowtail-base board.