Albert Bui Pros: mentioned often on BP Cons: accounting module is very weak, expensive for small operations Cost: $1 per unit, per month plus an onboarding fee (equal to two months of service).

They use a battery for backup, but if it beeps and they remove the battery guess what happens?

Here's my experience: accept the Section 8 applicant, inspector comes about a week after; he's required to fail you based on one minor infraction, such as a loose wall plate, missing fire extinguisher, smoke alarm without battery, etc.

The trap was removed and it contained 1 toothbrush, 1 pen, 1 eyeliner pencil, 1 AA battery, and 2 hair bands.

Most have lights that run on batteries (a small red light showing it is on and "recording") and they even have motion ones that move in a sweep pattern.

Single Family Homes can be buil in modules and the modules stacked for 2-3 story homes.

Sometimes they've let small maintenance issues go; we find out after they move that a closet door is off the track, the garbage disposal doesn't work, some of the window blinds are broken or jammed, light bulbs not working, holes in the walls from picture frames, tub stoppers missing, smoke detector batteries dead.

They use distance sensors and algorithims to map an area so they can go room to room on the same floor.They also roll themselves back to the recharging station when the battery gets low, and after getting charged, pick up where they left off.You can schedule it to run every day, every three days, whatever.Biggest drawback is that the dust bin is a little small.

I would recommend bringing some extra batteries in case one of the smoke detectors dies before he shows up. 

A concern would be that the batteries would be dead forcing my tenants to be locked out.