Introduction:Test Current: 0 ~ 3A (10A Maximum， If more than 3A， can not work continuously).Test Voltage: DC 3.2 ~ 10VOperating Current: < 20mALED Size: 0.28 inch LEDDisplay Ways: Blue display current， red display voltage.USB Extension cable: about 120mm.Measuring Rate: 500mS / times.Accuracy: 1% (± 2 digits).Package include:1x KW-203 Red & Blue Dual USB Charging Volt Ampere Meter.Extreme Working Conditions:Low supply voltage: +3.2 VMaximum supply voltage: +10 VWorking temperature: -10 Degree Centigrade~ +65 Degree CentigradeOperating Humidity: 10 ~ 80% (non-condensing)Working pressure: 80 ~ 106kPaSun exposure: no direct exposure.Output 1(Two functions):Data communication function: mobile phones or other mobile device and a computer for data transferCharging voltage output function: suitable for most of mobile phones， mobile power， and tablet PCs and other USB devices， if with Original Charger or other with high-current Identify resistance charger， can also supports IPad， IPhone and Samsung S4 High Current charge.Output2(One function):Charging voltage output function: universal-version， suitable for most of mobile phones， mobile power， tablet PCs and other USB devices， do not support IPad， IPhone and Samsung S4 High Current charge， NO data communication function.