From the product description:
This is the remote control dune buggy that can detect buried metallic objects when driven over suitable terrain, including backyards, dirt lots, low grass, or flat sand. The buggy can detect buried iron-based metals down to 4" and when it does, it flashes a red LED and begins beeping to alert you of potential treasure. The remote controls forward, backward, left, and right movement from up to 25' away. Metal detecting sensitivity can be modified to suit the terrain with a simple dial on the buggy.
Here's the link for the The Metal Detecting Dune Buggy.