The surveillance equipment was just two cell phones, completely unmodified except that they were connected to a power bank.
The assassin's electronic devices were not always high-end; issues that could be solved with a cheap cell phone did not necessitate any especially high-tech gadgets.
The cell phones were placed not too far from the roadside, hidden in the shadow of a clump of sword agave, with just a camera lens peeking out toward the highway.
The setup was arranged this way because the target, upon leaving home, would likely not be in just one car. By monitoring traffic from both directions on the highway, if no vehicles passed on the western side of the target's estate, but the eastern camera captured one, it meant the car must have come from the target's estate.
Then, there was nothing to do but endure the tedious wait.
From arriving around noon until four in the afternoon, the cameras recorded numerous vehicles, but none had come from the estate.