The Model SC-100R is an in-depth exploration of the electronic components included with the SC-100Snap Circuits Jr. Ideal for use in home schooling, middle schools and high schools, where students will grasp the basic principles of electronics. Topics Covered: Resistors Capacitors Transistors Motors Switches Series Circuits Parallel Circuits Project book of over 100 experiments, and student guide included. Teacher guide sold separately. Requires 2 AA batteries, sold separately.