UEB Mini USB Current Voltage Meter, DC Power Monitor Tester Dual USB Ports: convenient for you to monitor double devices simultaneously Multimeter: it can easily detect the operating current and output voltage of the devices Small Size and Compact Design: portable and convenient to use, no power or other ancillary equipment needed Easy to read: with LED display, read color for current and blue color for voltage, make it easy to be read even in the dark Scope of work: Current (0A - 2.5A) can detect mobile phone charger voltage compliance DC5V