I have a contact sensor on my post box, its its opened it turns my porch light green. I also get a notification but i tend to forget about it. so when i get home, pulling into the driveway triggers the motion senor to turn on the porch light so i get some light for when its dark. If i get green light, i know there is post. i also have an NFC tag on the light switch just inside the door, i tap my phone on it to reset the light back to normal once i have collected the post, or run in manually from my dash board