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"De Lu" hardly had any functions beyond essential components; even its structure was extremely crude—the astronaut's "seat" was actually just a foldable stool, and it even had an open-top design.
Why send the plain "De Lu" up first, which lacked any detection capabilities? Of course, it was still useful.
While "De Lu" was rudimentary, it had reserved basic automation interfaces, allowing it to be remotely controlled or connected to the signal port of the Explorer II robot, which was designed with data ports to facilitate astronauts in modifying programs during maintenance.
Explorer II could pull out a communication cable from the bottom chassis of "De Lu" and plug it into its own port, allowing it to download updated firmware and then operate the lunar rover at speeds more than ten times that of unmanned probes.
