How to use:This product is suitable for direct detection of 12V-220V AC and DC andindirect detection of the zero line, phase line of AC and the detectionof breakpoint. Features:1.Simple operation.2.Brand new & high quality.3.Item checks general electric products, electronic leakage and broken line.4.It's perfect for home use and handy when checking holiday lights.5.Item checks wire and tells you which is hot (fire), which is cold (ground), and incredible, No battery needed.6.Test range: DC 70-1000V7.Material: Plastic, metal.8.Dimensions: 13CM