THE GATEWAY DEVICE IS REQUIRED TO SYNC WITH YOUR SMARTPHONE. If it detects water, it will send notifications in real time to all the smartphones in a home that are synchronized with the application, preventing possible damage to your home. LED light indicator. Installation with 3M double-sided adhesive. Frequency: 2400-2483.5 Mhz operating temperature: from -10 to 50ºC. Powered by CR 2032 type batteries (included).