Review on 🔥 GeeekPi 4X Prototype Breakout DIY Breadboard PCB Shield Board Kit for Raspberry Pi 4 3 2 B+ A+ (Red) - Unleash Your Raspberry Pi's Full Potential with this Ultimate Shield Kit! by Vijin Wisniewski

I needed to control a refrigerator and wanted to be able to turn off the temperature input and current signal output when not in use. For the DB9 connectors shown in the picture I drilled a 1/8" hole and super glued the outer (non-signaled) pins in addition to soldering the pins. Plug or unplug the connectors. I would like to point out that this board does not have all 9 pins supported. You must select the bottom 4 or top 5 pins and cut off the row you don't need, or it won't fit on the breadboard.