The Roost Smart Battery is a Wi-Fi enabled battery that replaces the standard 9V battery in your smoke or smoke/CO alarms. It works with the free Roost app that you can download from the Apple iTunes or Google Play store.
The Roost Smart Battery includes an audio sensor that detects the sound (alert) emitted by a smoke or carbon monoxide (CO) alarm when it senses smoke or CO. If it detects an alert, the Smart Battery will automatically send a notification to your smartphone.
Please note, you must perform an initial setup of the Roost Smart Battery using the Roost app to connect it to your home Wi-Fi network. Until the battery is connected to your Wi-Fi network for the first time, it will not have any power. Also, the battery needs to be connected to your Wi-Fi network to send notifications of alerts to your smartphone.