The product has current function, which can charge all kinds of small rechargeable batteries within 0.6V - 30V within 10 - 20WCharging steps: (1) Determine the floating charge voltage and charging current of your rechargeable battery; (if the parameter of lithium battery is 3.7V/2200mAh, the floating charge voltage is 4.2V; if it is 12V rechargeable battery, generally set the floating charge voltage to about 14V)Charging steps: (2) Under no-load condition, set the output voltage to floating charge voltage; (if 3.7V lithium battery is charged, adjust the output voltage to 4.2V)Charging steps: (3) Set the charging current ( current value) and set the current directly. Note: when setting the current, calculate the lower , charge within the range, and use the super , the product will enter the protection state.Charging steps: (4) Connect the battery for charging.The product has current function, which can directly drive 0.6-30V,0-15W LED lampTo drive the LED lamp:(1) Determine the working current and maximum working voltage you need to drive the LED(2) Under no-load condition, set the voltage value and current value to make the output voltage reach the maximum working voltage and current of LED (Note: calculate the when setting the current, charge within the range, use over , the product will enter the protection state.)(3) Connect the LED and test the machine. This product can adjust the current value (between 0 - working current) to realize the LEDs stepless dimming and no stroboscopic USB tester system: Short press the ON/OFF button to turn on and off the USB output, long press the ON/OFF button for 2 seconds, the screen can rotate, 360 four-way rotation. Short press the UP/DOWN key to turn pages with one key.color:As shownMaterial:Plastic + MetalPackage Contents:1 x XY-UMPD USB Color screen charging tester1 x CableOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.