Full disclosure, I'm a cyber security nut. Love the topic and I mess with cyber security like an 18 year old plays Fortnight.
I'll keep my posts short and sweet. One of my favorite apps is this (for Android):
It scans for IoT sensors and BLE beacons. Fire it up on your phone or tablet and walk into a conference room in your office (or at Starbucks). Tells you tons about who is watching, listening, scanning and checking you out. -Fin