It's annoying to be surprised by an empty fresh water tank on a camping vacation. The E-Waterlevel module prevents such surprises. The wireless sensor measures the content of the water tank as a percentage and displays the remaining liters. With a glance at the E-Trailer app on your smartphone, you know immediately how much drinking water is left. Particularly practical: when filling the fresh water tank, you can see on the app how the fill level rises and thus turn off the tap in good time. This prevents overflowing. If the water supply is running low, you will receive a message on your smartphone. You can also use the E-Waterlevel module for the waste water tank. Here you receive a notification when the tank is (almost) full.