Functions: Includes 9 sets of power saving features. Temporarily store the current capacity and energy when the power is turned off. Re-open the possibility of accumulating the current capacity and consumed energy. Manual removal if no accumulation is required. Displaying the current and capacity on the same LCD screen, no cumbersome operations, just plug into the USB interface, you can monitor the charging status of your phone in real time. Intelligent memory loading capacity, can save mAh input from 9 sets of charging devices when power off. Easily view and see if the capacity of the charging device is real. U disk current detection, u disk working current is 50 to 100mA, when it exceeds 100mA, u disk may be damaged. USB interface voltage detection, the external voltage of the computer USB interface is 5V 5%, the output current is relatively constant, generally 500mA, and the notebook computer is only 100mA. Application instructions: 1: Click the button to display 1-9 sets of charging data. 2: Long press the button for 3 seconds to clear the charging data set. 3: Double click the button to rotate the screen to display. 4. Long press the button and insert the USB interface to enter voltage calibration: For example: (1) If display (5.526V ) Then double click the button quickly (2) If the display (5.528V), you can click the button to increase the display voltage. (3) Quickly click the button twice, if you are displaying (5.528V), you can click the button to reduce the voltage of the display. (4) Then double click the button again, if it shows (5.526V ), then click the button again, the screen will show the current calibration! The system will automatically perform the current calibration and automatically return to the main function page when the calibration is complete. Technical data: Material: ABS White color Current: 0-5A Voltage: 4-30V Time: 0-99 hours Power: 0-150 W Capacity: 0-999999mAh Indoor temperature: 0-80 Divide into groups: 0-9 group Charging resistance: 0-999.9Ω Positive voltage: 0-10V Negative voltage: 0-10V Product size: 56.6 * 24.7 * 11.2mm Product weight: 13.9 g Package weight: 17.3g If the output voltage exceeds the allowable charging voltage range of the electronic product, stop using the charger or portable power adapter. Packing List: 1 x USB test meter Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-dadangjia