9 NEW Kidde Combo Smoke & CO Alarms that are all NIB. All of them are interconnected, which means, if one goes off, they all go off.

The sensors last 10 years from the time that they are installed/activated (batteries last significantly longer). None of these have been activated. They have just been opened to verify the manufacture date.

• 30CUA10-V = Wired, 10-year battery backup, Interconnected, Voice (3)

• 30CUA10 = Wired, 10-year battery backup, Interconnected (5)

• 30CUAR-V = Wired, AA battery backup (included), Interconnected, Voice (1)

These retail for around $75 each (which would be over $720 with tax). You can find cheaper ones that look similar but they don't detect carbon monoxide.

$49 each or $399 for all 9 of them.