Smoke alarms & Carbon Monoxide alarms

[Sam Leon]

In Florida, if it's SFR homes older than 1980 there is zero requirement for these, although I have always provided two on older SFR homes. 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.  I usually have two, one in the hallway near the rooms, and one in the kitchen.

Thinking of replacing the ones I have with those ten year lithium ion battery ones.  Do they work?  Reviews seem to be mixed.

How about those with "voice alert" instead of the beeps?

Combo alarms with both smoke and carbon monoxide - thumbs up or keep them separate?