A: Hello. I don't know about the new Illinois law but the answer is no, it does not have a 10 year battery. You would need the I9010 model 21030869 or the P3010L model 21029618 to have a smoke alarm, battery only, with a 10 year battery.
A: Hello. All smoke alarms have to be replaced every 10 years per code and per our strong recommendations. They are only rated to be reliable for 10 years of use.
A: It should easily last 15 years or so. My prior smoke alarms (9 of them) lasted about 22 years (same brand) before they started dying off one by one, so I just replaced them all.
A: No. It is only a smoke alarm.
A: Hello. No, this alarm only detects smoke. If you want a smoke and carbon monoxide alarm, you will want the KN-COSM-XTR-BA model 21029902.
A: Hello. All of the current Kidde hardwired alarms interconnect together and work together. All of our P4010 series wireless alarms will work together wirelessly but will not work with the RF-SM-DC or the square KN-COSM-B-RF. This alarm is a single station alarm that does not interconnect at all and just works by itself.