How do the First Alert Wireless Interconnect smoke alarms link with each other?

The First Alert Wireless Interconnect integrated smoke alarm system automatically links through the software using 65,000 security code combinations. This eliminates manual dip switch programming saving confusion and time when installing. With First Alert Wireless Interconnect there is an extremely small chance of a duplicate code being programmed in an adjacent home, ensuring that your wireless integrated smoke alarm system should not receive interference from another system nearby.