These quirky robots are a perfect soldering exercise to get you started in electronics. The pack contains 5 exciting exercises, each teaching you different aspects of electronics. All of these robots come with button cell batteries and instructions to help you get started with electronics in a fun and easy way. Here's what you'll learn with each little badge/robot. You learn about light-emitting diodes (LEDs). Capacitron has 2 push buttons that show how to charge and discharge the capacitor. You will learn how capacitors work. Mr. Mr. Bee vibrates and moves (buzzes like a bee!). You will learn about intentionally unbalanced motors. Marv has 2 blue LEDs and a push button. You will learn the difference between a push button and a switch. Resistron has a variable resistor that dims the brightness of the LEDs. You will learn about resistance and Ohm's law.