“My neighbors shared an unsettling video of a woman holding this device up to their ring doorbell. She walked up, held it directly in front of the camera while it made a clicking/buzzing noise and then left quickly.”
Answer: “It’s a frequency scanner. Often used by car thieves. People have a bad habit of keeping their vehicle keys close to their front doors. These can read the codes from that distance and enable thieves to get into your vehicle, disable the security features in the process, and drive away with your car. Especially if the vehicle doesn’t require a physical key to be in the ignition.”
Answer: “Ultrasound scanner. That would explain the clicking and buzzing noises, so they are not only looking for car keys in the area of the door but exactly where it is as well. When they didn’t find anything they left. You should tell your neighbor to turn this whole video into the police, if they saw a face then the person can probably get arrested.”
I have one that has been in use for over 80 years, there is nothing missing on it.
Driveway marker