Features: USB Power Monitor The UPM can be used to measure the output performance of any USB charging adaptersPC USB Car USB chargers & Power banks etc.It can also be used to diagnose faulty USB ports evaluate the quality of USB cables & the capacity of portable power source. Low power MCU with 10bit ADC 25*15mm segment LCD shows LCD shows clear and accrate numerical readings 6 mades allows the user to measure real-time VoltageCurrentWalttCapacityTotal capacity & Time Very low current sensing resistor (10m ohm)for less voltage drop Over-voltage protection & alarm(Max 5.7V) Over-load protection (Max.3A) Self-closedown function to avoid the devices is over charged Specifications: Working voltage range:4.5~5.7V DC Working current range:0~3A Voltage precision:+/-0.5%Resolution:0.01V Current precision:+/-1%Resolution:0.01A Current sensing resistor:10mohm Standby current: 20mA How to Use 1.Connect the UPM into the host machine(Home USB charging adapterCar USB charger PC USB portportable power banketc. If the input voltage is out of the range of 4.5~5.7V DC the UPM will alarm ""BeBe"" & voltage value will blink 2.When the UPM is ready for use it will turn on blue LEDbeep & display the USB voltage (V) 3.Connect a target device to the UPM.The UPM will beep once againthen the lnitial mode voltage(V) will be raplaced with current(A) 4.The 6 modes of the UPM can be changed by pressing the button to cycle as follows Voltage(V) - Input voltage value is display in real time Current(A) - Current value is displayed in real time Power(W) - Input power is displayed in real time Capacity(mAh) - Output capacity add up to value in real time (Count from UPM & device connection through disconnection) Total capacity(Total mAh) - Count from UPM & USB adapter connection through disconnection Time(0:00:00) - Charging time escapaced in real time (Count from UPM & device connection through disconnection) 5.The current will be cutted automatically when the device is full charged or unpluged UPM alarms ''Be..Be..Be..''blue LED goes out and ''End''is displayed Press the button to clear ''End'' & switvh on current 6.Notes Capacity (mAh) will be charged after the device is un plugged Total mAh will be cleared after the UPM is unplugged from USB power source Blue LED ON/OFF - Output ON/OFf Protection -Over 5.7V or over 3A No output Setting Self-closedown function & End Level setting UPM detect the full charging according to End Level(EL).Pls set the EL according to different devices If the current is cutted automatically & device is not full chargedPls adjust the EL value bjgger Hold the button 3 seconds to enter the setting.Quick press the button to cycle through the value (10.20.30.40.60.off).Default value is 30 Save & exit with beep if no action within 5 seconds OFF - Close the function Package includes: 1 x USB Power Monitor