Features: Real-time detection of the state of charge of the appliance, voltage, current, power and other indicators. Widely used in the quality inspection of 3-C digital and peripherals products of usb interface.Good choice for electronics enthusiasts. With power-off storage function, when the mobile-power cut-off, it can store capacity and energy data,convenient for subsequent viewing, convenient for measuring the energy capacity of the mobile-power source. 10 sets of data storage. Can help us clearly understand the load-resistance and current discharge power, and better understand the range of use of the load. Specifications: Material:ABS Voltage resolution: 0.01V Voltage: 3-9V Current: 0-3A Size:Approx.67x29x12mm/2.64''x1.14''x0.47'' Note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x USB Voltage Tester