YKS USB Power Charger Voltage Current Waltt Detector Tester Monitor with LCD Display (Test Speed of Chargers, Cables, Capacity of Power Banks) Six modes with LCD display allows the user to measure real-time Voltage, Current, Watt, Capacity, Ultra-low current sensing resistor (10m ohm) effectively reduce the less voltage drop. Over-voltage protection & alarm(Max 5.7V), over-load protection (Max.3A). Full charge off automatically, to avoid overcharging. The UPM can be used to measure the output performance of any USB charging adapters,PC USB ,Car USB