Features and Benefits:Patented LED edge-lighting illuminates the handle red when power has been detected and green when grounded,Internal power source allows user to testlive and non-live DC systems (batteryincluded),;This self-powered Logic Light removes the guesswork when testing live and non-live 6V, 12V and 24V DC electrical systems. It is simple to use and has patented LED edge-lighting to clearly distinguish power or ground. Use it to test for poor grounding, broken wires, and blown fuses. Creates less draw than traditional test lights with incandescent bulbs, protecting your electrical system while you work