The USB Power and Current Voltage Detector by Brando makes it easy to measure the power of your USB device, as well as the current and voltage of your operating device.
All you have to do is simply plug one end of the small USB adapter into the USB Power and Current Voltage Detector, and the other end into your computer's USB port or any regular AC outlet.
Once this is done, the Brando device's built-in display will show current and voltage parameters.
The Brando USB Power Current and Voltage Tester works with all smartphones, tablets, laptops, desktop computers and any other device equipped with a USB charging port.
It is capable of reading voltages from 3.5 to 7 volts.