4WD - Download the app and get the hardware communicating how level your 4WD is. It is now easy to drive around anywhere in your 4WD and SavvyLevel will report the level of your 4WD. You can set your SavvyLevel to the position that you like level in your 4WD. You may like heads up - set that as level in your 4WD and let SavvyLevel do the rest! Easy to install and use immediately.