Review on GLOGLOW Overflow Leakage Detector Security by James Collins

I am using it with Openhab running on Raspberri Pi with Sonoff Flashed Tasmota RF Bridge. These sensors will only send a trigger when wet and will not send a code until dry again. Also, there is no heartbeat code and it cannot signal low battery. I've used a variable power supply and could never get it to detect low voltage. Looking closely at the board, I see that there is a low battery indicator, but no auxiliary circuitry. The signal reaches my RF bridge from the garage controlling the water heater about 30 feet away with one or two walls (drywall).