Technology update again: 4-wire sampling wiring, multiple alarm prompts for high and low voltage over power setting, battery internal resistance measurement, external independent splitter board, and fully plastic control board shell to ensure safety during 1000V high voltage power consumption Product Usage: This product is used to test the capacity of various batteries, discharge aging of various power adapters, and to detect parameters such as voltage, current, and electricity of various DC power supplies Colour:Black&White Material:ABS Package Contents: 1set x Boost and buck power supply Only the above package content, other products are not included. Note: Light reflection 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.