Usage Tips: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.