Can you call the police if someone keeps knocking on your door?

If they live somewhere else and come banging on your door, and you tell them to go away, they are now trespassing. You can call the cops on trespassers.

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And another question, are people stealing ring cameras?

Recently, thieves have been caught on camera stealing the video doorbells themselves. Whether they're setting the stage for a later attack or actually wanted the doorbell, the truth is these devices may not be as deterring as we thought. Here's what you need to know to protect your video doorbell and your home. How do you know if your house has been marked? Signs Someone Is Casing Your House & Your House Is Being Targeted by Burglars Unfamiliar Vehicles. Strangers Walk around the Street or Neighborhood. Door-to-door Scams. Flyers or Stickers. Toilet Excuse. Strangers Request for Help with Different Excuses. Strange Markings around the House. Strangers Take Pictures & Walk Away.

How do I outsmart my Ring Doorbell?

Here's how you can go about this: Turn on 'Disarmed Mode' on Ring. Disable 'Motion' Temporarily. Disable Specific Motion Zones Temporarily. Turn the Power Off to the Doorbell. Break off Ring's Internet Access. Are doorbell transformers supposed to hum? A transformer should emit mains hum, but it should be very faint, impossible to hear from a distance. On a busy day, you should have to put your ear to it in order to notice the sound, easier to feel by hand.

And another question, what is the cause of humming noise in a transformer?

Electric hum around transformers is caused by stray magnetic fields causing the enclosure and accessories to vibrate. Because the magnetic flux density is strongest twice every electrical cycle, the fundamental "hum" frequency will be twice the electrical frequency.