- KW203 USB current and voltage detector for charging and testing your device.- Test voltage: DC 3.2 - 10V， test current: DC 0 - 3A( maximum 10A ).- Working current is less than 20mA.- USB extension cable: About 130mm.- Accuracy: 1 percent ( about 2 digits ).- Working temperature: -10 - 60 Celsius Degree.- LED size: 0.94 x 0.39 inch.- Small in size， convenient to carry ， easy to use.- With dual red digital screen， can display the current and voltage of power supply equipment.- Dual output port， output I is for data transmission and charging， output II is only for charging.- Plug and play， operation is easy， made of high quality material， durable.- Compatible with mobile phone， tablet， PC and other USB devices.