Features: Simple?and?convenient?to?use. Portable?and?easy?to?carry. The?voltage?and?current?will?be?displayed?circularly. plug?and?play，it?can?work?without?additional?power?supply. The?USB?tester?can?test?voltage?and?current?of?the?power?supply?equipment?with?USB?port?. Specifications: Type:?tester Voltage:?3.5V-7V Current?:0-3A Color:?Blue Size:5.1?x?2?x?1.5?cm Package?Contents: 1x?USB?Current?And?Voltage?Tester