Features: This is the mini USB meter It can obviously reveal all the records Can easily measure the USB ( PC USB, mobile phone charger, vehicle charger , cellular strength , and so forth ) port and gadget operating recent and the output voltage charge-discharge capacity, performance, and choose the functionality of the charging cable charging equipment, this tester can meet the requirements ! Fit to factories, laboratories and personal use, wide selection and Easy to use, smooth to take alone, no additional power supply, Plug and play Description: DIY Supplies: Electric Display Type: Digital Only Code Accuracy class: Plus or minus 1% Operating temperature: usual Power Supply: AC Voltage: 4-20V+/-1% Current: 0-3A+/-1% Time: 0-99H Specifications: Model: KWS-V20 Material: Plastic Color: Blue Size: 59*23*13 1 IN - Connect the enter terminal to the output port of the charger 2 Press the RTZ reset button for three seconds before the display screen reveals reset 3 OUT - USB port for connecting the output end to the data cable 4 Input voltage reveal window (3-9V) accuracy ± 1% 5 Charging latest display window (0-3A) accuracy ± 1% 6 Battery means demonstrate window (0-99999mAh) 7 Working time demonstrate window (0-99H) Unit: minutes 8 Working time and capacity show with memory function after energy outage