The BT-400S tests 12V heavy-duty, auto, truck, commercial, and marine batteries as well as 12/24 Volt starter and charging systems. Battery size is not required to be entered into the unit. Simply choose between automotive or truck battery type batteries for testing. Eliminates tester input errors and allows the testing of batteries of unknown size. LED bar graph and numeric LCD display immediately indicate battery condition upon pressing the TEST button. Includes 4 ft heavy-duty abrasion resistant cables for vehicles with hard to reach battery compartments. This product ships in approximately 1 days