Estone 0-3A USB Adapter Red Blue Voltage Amp Tester LED Digital Mobile Charger 3.2-10V Data transmission function. Charge your mobile. Only charge your mobile. The power supply voltage, the test voltage: 3.2~10V. The test current: 0~3A (support 10A high current, but the error is big, cannot work for a long time) Working current: &lt;20mA