The RV Ez Level is the fastest and easiest way to level to your RV. The Ez Level is easy to stow and easy to operate. After placing 3 AA batteries in the battery compartment simply place the RV Ez Level on the floor of your RV. Push the start button and watch the indicator lights. As you start to level your RV with your existing leveling system, Red flashing indicator lights on the RV Ez Level let you know which side is low. When the RV is level, all indicator lights go Green. The RV Ez Level's unique design uses reliable solid state electronics which automatically shuts off when not in use, extending the life of the 3 AA batteries.