Don't buy this unless you already know what it is and how to use it. I am not liable for any use/misuse/abuse with this. The design is open source and available at https://github.com/McCloudS/dreame-pcb (originally forked from https://github.com/Hypfer/valetudo-dreameadapter).  

The unassembled kits come with the PCBs and parts necessary for assembling a Breakout and Breakout Breakout yourself.  No warranty provided when you are unable to assemble appropriately.  

Absolutely no warranty, no guarantees, no returns, no support, etc. Check the PCB for damage before using it, make sure there aren't shorts, don't insert it backwards, etc etc.... I suggest selling it / lending it / giving it to someone else after you're done, so other people can benefit from it. There's a group on Telegram for coordination, you can find the link in the Valetudo documentation.