Tests: Receptacles, Fuses, Electronics, Lighting Fixtures And MoreTests Continuity Of Circuits To Assure There Are No Breaks Or Intermittent Connections In The WiringTests AC/DC Voltage On Energized Circuits From 12V To 250VLED Indicator Glows Red When Voltage Or Continuity ExistsFull 360 Degree Bright Visual IndicationConvenient Screwdriver Tip And Pocket Clip For ConveniencePower Source: 2 - LR44 Battery (Included)