Description:Voltage Current Meters for power bank100% Brand New and High QualityFunction:Supports Data Transfer And QC2.0 Fast Charging EquipmentReal-time monitoring、 safe and reliableVoltage / Current / capacity / time / off automatically save the dataUSB KWS-V21 Features:Size: 59mm(+USB73mm) * 23mm * 13.5mmVoltage: 4 - 20vVoltage resolution: 0.01vCurrent: 0 - 3ACurrent resolution: 0.01AAccuracy: +-1%Weight: 20gbattery Capacity(0-99999mah)working time (0-99Hour)the working time and Capacity have Memory function when power off Package Contents:1 xUSB Charger Doctor Capacity Time Current Voltage Detector Meter Battery Tester