Kidde's Wire-Free Interconnectable Alarms make it easy to expand the protective coverage of your current interconnected system. These alarms features wire-free interconnectivity with other wire-free interconnect alarms. If one unit is triggered, all interconnected alarms will sound. These alarms shall work interconnected immediately out of the box without any user programming. Kidde Wire-Free Alarms enable you to extend the coverage and protection of your interconnected system without any need for additional wiring. You can even install these detectors in a detached garage or workshop and be alerted by another detector in the house.