The Google Nest Protect is a smart smoke and carbon monoxide detector that speaks to you and tells you where the danger is located in your home. This battery-powered version includes 6 Energizer Lithium AA L91 batteries for wire-free installation. The detector features a split-spectrum smoke sensor that can detect both fast-burning and slow-burning fires, providing comprehensive protection for your home.

Key features include WiFi connectivity (requires 2.4GHz network) that sends alerts to your smartphone when smoke or CO is detected, even when you're away from home. The Nest app allows you to silence false alarms remotely without climbing up to the detector. The device includes a built-in pathlight feature that provides gentle illumination when you walk underneath it at night, eliminating the need for separate nightlights in hallways and bedrooms.

The detector performs daily self-tests to ensure it's working properly and will notify you via the app when batteries need replacement, typically after about 5 years of use. Voice alerts clearly announce the type of danger (smoke or carbon monoxide) and the room location, helping prevent middle-of-the-night confusion. This 2-pack set is ideal for multi-level homes or covering multiple rooms with interconnected protection over WiFi.