Sunfounder HC-SR04 Case

The Sunfounder version of the HC-SR04 is slightly different from most low-budget modules out there. For one, it doesn't have the protruding crystal oscillator between the emitter and receiver. It also uses a socket to prevent you from connecting the wires incorrectly.

This means that most of the HC-SR04 cases out there don't work without considerable modifications.

This is a snap-fit case, allowing you to screw the backplate into position and then snap the front part of the case in place.