This is RD6024-W dc to dc converter, it has extra APP control compared with RD6024. for operation way, please check the instructionperation instruction, please check the ^^ RD6024-W is the communication version, it can be connected to PC software or APP ^^ please check the manual to see the communication requests ^^ There is a backup fuse in the box, if you burn the fuse, you can insert the fuse in the socket next to the burned one for short time use and in 10A range, you still need to replace the damaged one if you want to use full range ^^ Integrated panel, you only need a shell and a AC-DC power source to form a powerful and adjustable power supply.