WHY THESE $? Aliexpress Modules are IMPRESSIVE?

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The links below are affiliate links, but that will not affect the normal price. If you buy something I get a few cents towards for buying more gadgets and modules for us to explore and test,thank you.
🔥12% OFF Aliexpress Campaign:https://s.click.aliexpress.com/e/_c3v...

🔥LED Flexible matrix panel,app control,RC control bluetooth connection with custom text,clock,pattern effects RGB programmable.
Aliexpress link:https://s.click.aliexpress.com/e/_EuW...
https://s.click.aliexpress.com/e/_EQ1...
full video review:   • Why This $? AliExpress Module is Absolute ...  

XY6008 DC Regulated Power Supply 60V Maintenance Step-down Module TTL/WIFI Connected LCD Stabilization Buck Conver Module
Aliexpress links:
Full video review for XY6008:   • WHY THIS $? Aliexpress XY6008 DC regulated...  
DIY PSU assemble:   • HOW I made 500W Adjustable PSU using XY600...  

-AC110V/220V to DC 12v,24v,36v,48v isolated switch power supply module 1A,2A,4A,6A,7A,9A power supply board.
Aliexpress link:https://s.click.aliexpress.com/e/_EyX...
full video review:   • THIS $? Aliexpress Isolated Switch Power S...  


-ZK-4KX ZK-5KX DCDC Buck Boost Converter CC CV 0.5-30V 4A 5V 6V 12V 24V Power Module Adjustable Regulated Laboratory Power Supply
Aliexpress links:
How To Build Portable Power Supply using 20V Drill Battery!
   • How To Build Portable Power Supply using 2...  

-DPS3003 DPS3012 DPS5015 DPS5020 DPS3005 DPS5005 DC 30V 50V CNC Digital Adjustable Step-Down Buck Converter Power Supply Module.
Aliexpress link:https://s.click.aliexpress.com/e/_c4d...