It's battery operated and you program a code. 

If you filled up with gas once this year, saving you $5,000 in gas (that's a LOT of miles you do to save that much in gas), you must spend a lot of time sitting by the side of the road with an extension lead waiting for the batteries to charge.

Even though I had a battery swap plan, I would get the inevitable call about a chirping alarm.  

Wireless and battery-free.

If the power goes out, you need a battery back up on your sump pump. 

For example, you can't give a holiday gift to only who you think are good tenants because one of them would post "Thanks Sam for the $25 AMC movies GC my boy friend and I saw Avengers last night xoxo" then your other tenants who didn't get a GC will feel left out.I visit my properties once a month for regular maintenance, mostly for little stuff, like changing AC filters, test smoke alarm batteries, test GFCI receptacles, pour bleach down AC condensate drain lines, exercise water supply stop valves, feel under any drains to check leakage, test water heater T&P valves, etc etc etc...they do not need to be done monthly but that's what I do at each property. 

It is much higher end than the wifi cameras you get in a box store.Mine are ethernet and get power over ethernet so I never have to worry about changing batteries.

It took into account servicing and battery replacement on the Tesla.

Solar panels on the roof charged several car batteries in the sun room situated off the front of the kitchen.

@Kyle J.I appreciate your thoughts Kyle 😊There’s actually a number of inexpensive body cams that have an 8 hour battery life with continuous recording.