Wi-Fi device detection

I have a friend that is constantly hacked. Changes everything, moved to another city, changed all of his accounts and even replaced his phone. After a couple months i get odd e-mails from him,which he doesent send and have sketchy links.
All this over not joining a local church group of all things. The perp is some sort of computer tech that works for law enforcement.
This guy is messing with my buddy’s neighbours, the rental agency and anything else to make my buddy’s life miserable.
So, one psycho on a mission making someones life miserable is a real thing.

A couple of my surveillance cameras have microphones and speakers, the latest one i got has a very large battery, solar panel and is efficient on power. 100 yard wifi range is common.

GREAT PR for the church and their membership, huh?