Circuit Scribe Maker Kit &ndash; Includes STEM Workbook, Conductive Silver Ink Pen, and Everything You Need to Learn, Explore, and Create Your Own Circuits and Switches! CIRCUIT SCRIBE SUCCESS - Designed by PhD students at UIUC and Harvard, Circuit Scribe puts the power of conductivity into a pen, making the joy of creating circuits available to everyone who can doodle. CREATIVE SCIENCE AT HOME - A perfect introduction to the more advanced concepts of circuitry, the maker kit helps build your understanding of inputs, outputs, and single processing with hands-on fun. EXPLORE, LEARN, CREATE - In addition to more advanced circuitry, this kit lets you experiment with light sensing, timed circuits, piezoelectric materials, and more! With Circuit Scribe, making means learning. GET BUILDING NOW - The Maker Kit has everything you need to start creating, inventing, and learning about circuitry right out of the box. It's great for beginners and makes a perfect educational gift. INCLUDES - 9V battery and adapter, 2 Bi-LEDs, SPST Switch, NPN Transistor, photoresistor, potentiometer, blinker, buzzer, silver ink conductive pen, STEM workbook, and more!