Instruction: Evaluate the answerability of a question by analyzing the related document, outputting yes if the document contains information addressing the question, and no otherwise.

Input:
Question: Can these be linked to existing AC powered Smoke/CO2 sensors that are hardwire linked?
Document: Love this heat-smoke-free detector. It does so much more than all the others I have around the house. Buy it!
I have 5 of these in my system and they are easy to setup and work reliably. Programming is as easy as any other 2gig module. One thing to note is that if you want Smoke, Heat, and Freeze protection it will take up 3 zones in your system. Loop 1 is smoke, 2 is heat, 3 is freeze. You can use one or all three detection parameters. Installation is easy with 2 supplied screws and 2 supplied plastic anchors. Three AAA batteries are also supplied.
It's not clear in the instructions. Would have been 5 stars if not for the testing ambiguity.
It is on the box and there is a sticker on the device. It will say in what year it needs to be replaced. Through multiple purchases, here and other places, I've realized that some sellers sell devices that were made a few years ago.After programming my panel it finds the detectors relatively quickly. Testing is more difficult than it should be. If you hold the button on the detector for 5 seconds the detector will sound but not the panel.
It is a very nice item. Small is size and works great. Highly recommended if you have 2GiG security system.
Answer: no