The Lucky Light KW4-8828AGB is a 12v DC automotive measuring light with 3 functions. It has a colored signal indicator, a digital LCD display, and a buzzer alert. The signal indicator has a red, yellow and green light to represent test results and the LCD screen displays voltage, current, resistance, frequency and diode test data. The buzzer alert beeps when the user presses the power button and gives audible alerts for over-load, reverse polarity and other conditions. The KW4-8828AGB is equipped with a 7-pin terminal adapter for testing motorcycle, car, and truck electrical components.