Relay equipment
This picture is pretty creepy, and we’d probably lose our minds if this happened to us. One night, the OP’s Ring doorbell recorded footage of a stranger holding onto a mysterious device. After the trespasser learned that they were being watched, they immediately turned around and fled.
After asking on Reddit what the device was, someone explained that it was a piece of relay equipment. Basically, the guy holding onto it was a potential car thief. The relay device can activate your key fob. The guy was hoping that the homeowner’s car key fob could remotely turn their vehicle on. You can probably guess the rest.