Take a look at the post below. @162884 purchased that one for use in a wired environment. Perhaps he/she can confirm.
Additionally, even wired sensors have batteries for when the power goes out. Wired sensors will alert on a low battery conditions.
From the listing by @TheSmartestHouse:
If your smoke / carbon monoxide detectors work in tandem with other units in your home, you only need one Ecolink Firefighter to add Z-Wave functionality instead of replacing all sensors!
@TheSmartestHouse should also be able to advise if they are wired detectors.