Adafruit Circuit Classics - Dual LED Flasher Kit includes all the necessary components to make LEDs light up and blink. This kit provides a simple yet complex functionality and understanding the working of the kit is a fun puzzle with analog electronics. The Dual LED Flasher Kit includes the dual LED flasher PCB, through-hole components, and a display stand. The PCB includes the circuit as well as a hand-drawn circuit schematic and description. Through-hole components can be easily soldered on the PCB as it features clear footprints and large solder pads. The display stand is made of high-quality blond ash wood and allows the work to be displayed. The Dual LED Flasher Kit does not include batteries, but the alligator clips can be used to connect a 9V battery or other power supply devices.