Wi-Fi setup mode can be enabled in Kidde Smart Devices by a few techniques:

• Kidde Smart Smoke Alarms & Combination Alarms (Includes IAQ Models) (2022 - 2024) - press and hold the center PTT button for 8-12s until you hear three consectuive chirps.
• Kidde Smart CO + IAQ Plugin - Press and hold the Test/Hush button on the device for 8-9 seconds until you hear 2 beeps. Release button.
• Kidde Smart Water Leak Devices (Rev A) - Take batteries out, and place batteries back in the device. 
• Kidde Smart Water Leak Device (Rev B) - Press and Hold the reset button.