2.4GHz Wi-Fi Direct Connection (5GHz Not Available): Battery powered smoke alarm can be connected to X-Sense Home Security App via 2.4GHz Wi-Fi network, with direct connection to the app, not compatible with base station Free Real-Time Notifications: Control XS01-WX Smart Smoke ...2.4GHz Wi-Fi Direct Connection (5GHz Not Available): Battery powered smoke alarm can be connected to X-Sense Home Security App via 2.4GHz Wi-Fi network, with direct connection to the app, not compatible with base station Free Real-Time Notifications: Control XS01-WX Smart Smoke Alarm remotely via the mobile app and receive quick notifications for alarms, failures and low battery warnings 10-year sensor life: Complies with EN 14604, guarantees reliable protection thanks to its photoelectric sensor that detects incipient slow-burning fires, and its service life of up to 10 years Small and Compact: Measuring only 78 × 48 mm, this fire detector with replaceable battery is small and ultra-thin. So it is easy to take along when you travel Device Sharing Function: Using the X-Sense Home Security app, you can share your devices with up to 12 different app accounts so simultaneous users can receive real-time push notifications Note: The paid subscription service of the X-Sense Home Security app is only available in the US and does not include any paid service in Europe