ES-04A         4 LED Flasher Kit    (DC 6 ~ 9V)

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Each transistor drives 2 LEDs in series  alternately. 
Flashing rate can be changed by using different values of the electrolytic capacitors ( C1 & C2) .
Runs on 9V battery. Can also operate from 6V supply but with lower LED brightness.

We sold thousands of these kits to schools. A great starter kit for beginners to learn soldering skills & reading schematic.

Sold without 9V battery.   Battery clip included.

CLICK THIS LINK TO LEARN HOW A TRANSISTOR ASTABLE
 FLIP-FLOP WORKS
How transistor astable circuit works --- (1) 
How transistor astable circuit works --- (2)