Roost Smart Battery

What's the use of a smoke alarm when you're on the other side of town or better yet in another state. Roost Smart Battery transforms your old smoke and carbon monoxide alarms into smart detectors that will alert you via its smartphone app when your alarm sounds or when the battery is running low, no-matter where you are. Made to retrofit your existing 9-volt battery. Package includes 2 batteries.

$42.14