Sienoc USB Power Meter USB Current Meter - Also Working as USB 2.0 Hub with Two USB Ports for Charging and Data Sync - Test Voltage: DC 3.2~10V,Test Current: 0~3A ,Operating Current: &lt; 20mA,LED Size: 0.28 inch LED USB Extension cable: about 120mm,Measuring Rate: not less than 500mS / times,Accuracy: 1% Display Ways: red display current, red display voltage USB Output Port 1 is dedicated for both Data Sync and Battery Charging USB Output Port 2 has built-in circuit for Accelerated Large Current Fast Charging