After that first meeting, I went and checked the county criminal records on him and he had just been released from jail where he was put for assault and battery.

You can also get detectors now that have a 10 year battery.

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.