The Camco Wireless RV EZ Level is the fastest, most convenient way to level your RV. It allows you to monitor your RV’s level in both axes simultaneously and has Bluetooth capabilities to display your RV levels on your smartphone or tablet. The EZ Level includes an easy-to-use mobile app, but can also be used without connecting to a device. Product features illuminated indicator lights?green means level; red indicates a low side. The EZ Level automatically shut off when its not in use, extending the life of the (3) AA batteries (not included). Also features an on/off switch. Product is simple to operate and stow. Measures 8 5/16-inches (diameter) x 2 5/32-inches (tall). Camco makes quality products for RVing, boating, camping, towing, tailgating, and grilling that help you take your passion for the outdoors to the next level.