Item Type: USB C Power Tester_x000D_ Product Material: ABS_x000D_ Product Model: KWS-1902C_x000D_ Colour: Black_x000D_ Voltage: DC4-30V_x000D_ Current: 0-5A_x000D_ Capacity: 0-999999mWh_x000D_ Load Resistance: 1-9999.9_x000D_ Voltage Resolution: 0.002V_x000D_ Current Resolution: 0.002A_x000D_ Power: 0-150W_x000D_ Product Interface: USB C 24pin_x000D_ Display Screen: 0.96in Color Screen_x000D_ Test Direction: Two-way_x000D_ Support: QC2.0/QC3.0_x000D_ Applicable Temperature: 0-80_x000D_ Timing: 0-99 hours_x000D_ Product Size: Approx. 55 x 26.5 x 6mm / 2.2 x 1 x 0.2in_x000D_ How to Use: _x000D_ 1: Single short press once to change the display page;_x000D_ 2: Quickly double-click the button to rotate the display page_x000D_ 3: Long press the button for 3 seconds to clear all saved data;_x000D_ 4: Charging Flow Direction Indicator: The color of the arrow and the scroll speed follow the current; _x000D_ Small but changes, the order of current from small to large: green, yellow, orange, red, the larger the current, the faster the scrolling speed, and the flow direction indicator will not be displayed when there is no current._x000D_ 5: Current and Voltage Calibration Method: You must use a standard voltage of 5.000V to press and hold the button to power on. When the "Factory setting" is displayed on the screen, you can release the button and the product will automatically calibrate._x000D_ Calculation Method of Mobile Power Capacity:_x000D_ The mobile power supply is fully charged and connected to KWS-1902C(data cleared first) and electrical appliances, and discharged until it stops output._x000D_ Method 1: Mobile power capacity = KWS-1902C Measured mAh Data x Output Voltage + Battery Voltage + Efficiency_x000D_ Method 2: Mobile Power Capacity = KWS-1902C Measurement mWH: Battery Voltage Efficiency_x000D_ (General mobile power output voltage is 5V, battery voltage is 3.7V, efficiency is about 85-90%)