Samurai Koji's, (pronounced KOH jee) meaning "Abundance and two", expression is constantly changing to keep his friends from guessing his true mood. One second he's happy, and then he's not. Fun kit to build that requires many soldering connections to create the green LED happy/smiley face and the red LED upset/sad expression. This circuit uses a 555 IC to alternately flash the two groups of bright LEDs. Operates from one 9V battery (not included). Size of PC board is 3" x 4". Complete with all parts and PC board. Requires soldering. Skill Level 1.