USB 2.0 Digital Multimeter,Ammeter Voltmeter Capacity Power Meter Tester The USB monitor will display voltage, current, capacitance and power in the same time Multifunctional: capacitance checking, capacitance cleaning, Output I, Output II! Dual USB Port and bi-color display USB Output Port 1 is used for both charging and USB communication. USB Output Port 2 is used for large current fast charging