So my in-laws call me to install one of those video doorbells, no problem mom. Drill, mount the new bracket, wire it up (red and white wire), no power to the unit. Oh btw, she mentions the regular doorbell stopped working about 5 years ago. Call my son and have him bring my multimeter. No voltage at the doorbell. Move on to the chime box, get connectivity to the button, get connectivity to the t-former. Oh the chime must be crap. Drive across town, buy a new one at Home Depot. Remount, wire up, and still nothing. Maybe I wired it wrong (which is next to impossible) so I hard wire the doorbell so it should always be on, nothing. I ask where their transformer for the doorbell is, no idea house was built in 84'. I pull a large lightswitch cover off to see if it's close to the button, check the crawlspace, and the attic, nothing. Even pulled the fuse box metal casing off the garage door to see if they stuck in there, nope. I told them an electrician with the tools to trace the wiring might have better luck, btw this was 4 hours into the 10 minute job.