Features: Portable usb power ESD testing tool that generates sustaineds 300Volt pulse voltages without external charging, for professional USB interfaces diagnostics and stress testing. Engineered with circuit and 600V heat shrinks tubing protections, it ensures safe high voltages output (230V±30%) while maintaining plastic construction for durability. Ideal for electronics engineers, motherboards manufacturers, and repair technicians working with USB 2.0 interfaces in computer/ARM hardware development and quality controls. Perfect for ESD resistance verification on computer motherboards, set top box, digital signage controllers, and embed systems during or production line testing phase. Complies with professional safety standard through automatic voltages regulation and overloads protections, while its USB bus power design eliminates battery dependency for workplace convenience. Specifications: Component:ABS Input:5V 1amp Package Includes: 1Piece Voltages Tester note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color.