This is the device that solves the mystery of a lit check engine light. It plugs directly into a car’s On Board Diagnostic System II interface (OBD II), and displays the trouble code along with what it means on the device’s LCD screen. It has a stored database of over 3,000 generic and manufacturer specific codes and also enables you to turn off the check engine light. Smaller than a smartphone, the device stores comfortably in a glovebox or middle console. Compatible with all American-made vehicles with a 1996 model year or newer. 4 1/4" L x 2 3/4" W x 1" D. (7 oz.)