Battery life isn't great.

You need to change the batteries every year.You might also look into LandlordLock.com.

On condos & apartments they have to be hardwired and much stricter guidelines on where and how many.Curious what the landlords opinions are on the battery operated ones. 

It was in South Australia, Flinders Ranges 1963. 5 acres to feed one head until we drilled for water as droughts could last for several years.Because of the geo-thermals the water would come out of the ground warm enough to shower in & you had to remove the hard water scale from the shower head constantly.The windmills would pump the water & also generate the power to charge our household batteries for power.

Put a couple battery-operated motion sensor shrieker alarms inside.

If your circumstances changed or the property didn't perform to what you wanted or any other battery list of reasons.

All emissions were good except for the monitors, the guy had done some repairs and disconnected the battery and thus the reset procedures had to be taken.

First thing we'll do is install an alarm system that runs on batteries.

They are standard AA batteries, so nothing proprietary.Let me know if you’d like a more formal quote.

Of course I lost the saw with a battery in it, so two more batteries and another charger are nice to have.