This a mount, and basic sensor model for your own needs. As many RadioShacks went under, many people got these for cheap. They are very close to other ultrasonic sensors, but not quite. The holes may not be a perfect fit for all as they seem to have low tolerance on where they are soldered on board. BUT they are easy to modify. If you print this face down it mounts nicer, if you print it face up, it looks nicer, but will need some clean up inside.