On camping vacations it is annoying when you are surprised by an empty fresh water tank. The E-Waterlevel- module prevents such surprises. The wireless sensor measures the content of the water tank with percentage accuracy 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 is rising and thus turn off the tap in good time. This prevents overflowing. When the water supply runs low, you receive a message on your smartphone. You can also use the E-Waterlevel module for the wastewater tank. Here you will receive a notification when the tank is (almost) full.