The rows on each side of the cover circuit board follow the same pattern for installation.

The left side of the circuit board has 3 spaces: The top space corresponds to the wall sensor with the shortest wire and no tab on the circuit plug.

Just below that is where the leftmost wall sensor plugs in. It has a longer wire and a small white tab on its circuit plug.

The space on the very bottom is for bObi Pet’s sensor strips. They have red and white wires.