Features 18 Inch LCD Display: This adjustable power supply regulator module features a 1.8 inch LCD display screen which has excellent contact and a long lasting display. 2Good Heat Dissipation: This voltage regulator module power supply adopts thickened heat sink, contains an external fan port to extend the fan, and the upper and lower boards are connected more reliably and stably. 3Multiple Guards: This buck boost converter has multiple protections, such as anti reverse connection, anti backup, under voltage guard, over voltage guard, over current guard, over temperature guard, over power guard, over time guard, over capacity guard, and over energy guard. 4Independent Silicone Keypad: This step up down transformer board module uses independent silicone keypad to set voltage or current, with one key to enter and one key to exit, fast and concise, refusing to be cumbersome. 5Wide Application: This step up down power supply has a wide range of applications and can be used for electronic equipment testing and calibration, electronics manufacturing, industrial automation control, communication equipment and servers. Specification Item Type: Step Up Down Power Supply Model: ZK-SK90 Material: ABS, Silicone, Aluminum AlloyOutput Current: 0-5A Output Power: 90W Current Resolution: 0.001A Data Group Storage: 11 Groups Screen Size: 1.8 Inch Upgraded Display, 36 x 29mm Visual Range Conversion Efficiency: Approx. 88% Buzzer: Yes Soft Start: Yes Guard Mechanism: Input Anti Reverse Connection: Yes Output Anti Backflow: Yes Output Over Current Guard (OCP): 0.001-5.2A Adjustable, Factory Default 5.2AOutput Over Power Guard (OPP): 0.01-91W Adjustable, Factory Default 91WOver Temperature Guard (OTP): 30-99 Adjustable, Factory Default 90Timeout Guard (OHP): 1 Minute-99 Hours 59 Minutes, Factory Default OffOver Capacity Guard (OAH): 0.001-9999Ah, Factory Default OffOver Energy Guard (OPH): 0.001-4000KWh, Factory Default Off Package List 1 xStep Up Down Power Supply