Kidde's NEW 120-Volt Hardwired Combination Smoke and Carbon monoxide Intelligent Wire-free Alarm connects with other intelligent Smoke and Intelligent combination alarms You do not need a home Wi-Fi system to use these units. Multiple wireless units create their own independent wire-free alarm network. Equipped with voice and wireless interconnect and a 10-year lithium battery backup. Compatible with Kidde, FireX, Code One, and Sentinel products Kidde offers a full range of 120V AC wire-in life safety products with interconnect capability to provide the most immediate and complete system available. When any one interconnected alarm is triggered, all interconnected alarms within the home sound an immediate warning.