Description Digital Display USB Multifunction Tester 3V 30V Mini Current Voltage Charger Capacity Tester with Overcurrent Overvoltage Protect Specification 1 Input output voltage 3V 30V2 The input output current 0A 3A3 The test capacity range 0 99999 mA4 Accuracy 1 5 The test voltage current discharge flow6 The communication function 7 Timing YES8 The over current protection Yes USAGE Power display current and voltage a single short press the button for about 0 5 seconds to view the capacity and timing screens When displayed on the screen press capacity around button for two seconds to clear the stored data When the display screen at the timing of the long press button for two seconds will be flashing numbers and then press a single button for 0 5 seconds each time the cumulative 0 5 hours per block long press 2 seconds to confirm the save To not adjusted to the timing of the timer function 0 hours 0 hours is normally open phone is fully charged to automatically turn off the output No load 20 seconds automatically shut down output Current exceeds 3A will automatically shut down when the output voltage is higher than 22V Close current output window displays OFF Single short press the button for about 0 5 seconds to activate the output Three characteristicsThe phone is fully charged to automatically turn off the output No load 20 seconds automatically shut down output It displays the voltage and current data mAH timing easy viewing It can detec