the products you can get in this opion is DPS5020 USB BT+ case, for assembly and operation instruction, you can download it below and check ^^ Its adjustable output voltage range is 0- 50.00V, step by 0.01V. and make sure that the input voltage is 1.1 times higher than output voltage. ^^ Its adjustable output current range is 0- 20.00A, step by 0.01A. ^^ it has 10 data group to store settings, and you can press the V and A to quick set the value ^^ You can also set the over voltage value, over current value, over power value, screen brightness and other settings at the setting page