3 in 1 USB Tester for Charger Voltage Current Detector, Mobile phone Power Voltage Current Multimeter USB Charger Detector, Digital Multi-function USB Charger USB Out Voltage Current Capacity Multimeter Detector. Out USB Voltage: 4V-20V ( 1% accuracy ) Current: 0-3A ( accuracy of 0.4% ) Battery Capacity (0-99999mah) Working time (0-99Hour) The working time and Capacity have Memory function when power off
