This was a quick little fun kit from Boldport.
Nothing blinks, no batteries, it is only solder and printed circuit boards but the completed holder is cute and works.
I tin my iron and then heat the joint between the two boards. I apply the solder to the joint while moving the iron across. The solder will flow and move. It takes practice to understand where it goes. pic.twitter.com/JfA42KYUGT— Jenn (@geekgalgroks) June 12, 2019
The completed holder is not square but it was a great test of my solder skills.