WSG105, Soldering Minikits Maker Kits, Various

Kit is easy to build and works well. I gave 3 stars because these kits are supposed to be for educational purposes, but there is no explanation of the circuit or how the device works. The devices uses a microcontroller so the operation can't be determined by the circuit alone. Mad labs does provide code for the microcontroller on the internet, but it's written in assembly.