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if its connected via relay its isolated and should be fine regardless of mains such as these device types HydroCheck Water Sensor Alarm, Smart Water Leak Detector for Home & Basements | Made in THE USA | Automatic Flood Detectors and Water Alarm, Pure Water Capable (WaterWatcher) - Home And Garden Products - Amazon.com sorry the chat convo i pasted in was more so to highlight the issues with the sleep mode and if there was a way to bypass it, like if i attached a battery pack with even more batteries to retain the year+ life but with the device doing even more check ins trying to avoid this"The App Suffers from the Exact Same Blind Spot The Shelly app cannot communicate with a device that has its wireless radios turned off. Because theShelly Flood Gen4is hardcoded to sleep, it only wakes up and connects to the Shelly Cloud once every few hours (or up to 24 hours depending on settings) to send a routine battery and status check-in. If someone kicks the sensor or the battery drops to zero right after a routine check-in, the Shelly Cloud has no way of knowing. On your phone app, the device card will simply show a green "Online" or "Healthy" checkmark, displaying the data from its last successful wake-up window. It can sit there completely dead for hours, and the app will continue to read "Dry.""