The Mr. Circuit I - Discover Electronics Lab is recognized around the world as one of the very best tools for teaching basic electronics in the classroom. This is because it is hands-on, self paced and easy to use - for both teachers and students. This lab includes 33 lessons and experiments for learning the basic theory of electronics, the major components used in electronics, and fun and exciting projects that the students build on solderless circuit boards and pwer with a nine volt battery. There is no soldering required for this lab.