Features 1、Easy Operation: Individual silicone buttons of buck boost converter set voltage or current. 1 click to enter, 1 click to exit, fast and simple, refuse tedious. 2、1.8 Inch LCD Display Panel: Step up down power supply has a 1.8in LCD display that you can see clearly the data for convenient operation, improving efficiency. 3、Enhanced Performance: Buck boost module features upgraded power, thickened heat sink, external fan port for optional expansion. More reliable and stable connection for upper and lower boards. 11 storage spaces available. 4、Multiple Protections: Buck boost converter features reverse connection, backflow prevention, undervoltage safety, overvoltage safety, overcurrent safety, overheating safety, overpower safety, timeout safety, overcapacity safety, and overenergy safety. 5、Independent Upper and Lower Board Architecture with Independent MCU: Convenient replacement of LCD or color screen display panels. Power board can be used independently. Specification Item Type: Buck Boost Converter Material: ABS, Silicone, Aluminum Alloy Input Voltage: 6-36V Output Voltage: 0.5-36V Output Current: 0-4.5A Output Voltage Accuracy: ±0.3%+3 digits (calibratable) Output Power: 40W Current Resolution: 0.001A Data Group Storage: 11 groups Screen Size: 1.8 inch upgraded screen, Approx. 36 x 29mm / 1.42 x 1.14in visible area Conversion Efficiency: Approximately 88% Buzzer: Yes Soft Start: Yes Safety Mechanism: Input Reverse Connection Safety: Yes Output Anti backflow Safety: Yes Input Under Voltage Safety (LUP): Adjustable from 5.5-35V, default value 5.5V Output Over Voltage Safety (OUP): Adjustable from 0.5-37V, default value 37V Output Over Current Safety (OCP): Adjustable from 0.001-4.6A, default value 4.6A Output Over Power Safety (OPP): Adjustable from 0.01-41W, default value 41W Over Temperature Safety (OTP): Adjustable from 30-99℃, default value 90℃ Time Out Safety (OHP): 1 minute to 99 hours 59 minutes, default value off Over Capacity Safety (AH): Adjustable from 0.001-9999Ah, default value off Over Energy Safety (OPH): Adjustable from 0.001-4000KWh, default value off Package List 1 x Step Up Down Power Supply