Kidde RF-SM-ACDC Quick Setup Guide - Manual (Page 2)

Battery Operated:
Alarm DOES NOT have any wires connected to the back of it.
The alarm is ONLY powered by a battery or batteries.
Hardwired:
Alarm has two wires (typically white and black colored) connected
to the back of it. Alarm DOES NOT have a third wire (typically red,
orange or yellow in color) connected to the back of it. You can
determine if an alarm is Hardwired by confirming that two power
wires are connected to it, and then by pressing the test button on
the alarm, and listening for the other alarms to sound. If other
alarms DO NOT sound, the alarm is Hardwired.
Hardwired with Interconnect:
Alarm has two wires (typically white and black colored) connected
to the back of it. Alarm DOES have a third wire (typically red,
orange or yellow in color) connected to the back of it. You can
determine if an alarm is Hardwired with Interconnect by confirming
that three wires are connected to it, and then by pressing the test
button on the alarm, and listening for the other alarms to sound.
If other alarms DO sound, the alarm is Hardwired with Interconnect.
DO NOT connect two RF-SM-ACDC alarms to a Hardwired with
Interconnect system. Doing so will result in the RF-SM-ACDC alarms
triggering each other. They will not stop alarming until one is
disconnected from the electrical circuit. If your home has Hardwired
alarms, which are not interconnected, you can use up to twelve
RF-SM-ACDC alarms.
TEST YOUR ALARMS WEEKLY: This ensures that changes in your
environment (i.e. moved furniture, addition of electronic appliances)
have not adversely affected the operation of your Wireless system.
820-0926 Rev.A
Types of Alarms