Features: Features: Can measure the current and voltage of power devices with USB port. Plug and play, no need for any additional power supply. Voltage and current will be displayed circularly. Compact size for easy carrying. High quality and brand new. Specification: Color: transparent blue (as picture show) Dimension: length 59mm (including USB 73mm), width 23mm, height 13.5mm (approx.) Voltage: input voltage 3-9V Current: input current 0-3A Precision: 1% Feasible range: 3.5 - 7.0 V, 0 - 3A Resolution: voltage 10mV, current 10mA Error range: voltage 1%, current 2% Full scale voltage drop: 200mV Workable temperature: 0-60 degrees Celsius Package content: 1 * USB current and voltage tester Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.2. Please allow slight manual measurement deviation for the data.