Check in store

I want to teach kids about the technology we had before self-flashing LEDs :)

It not using obviously self-flashing led but old good astable multivibrator.
It is a nice piece of old fashion technology.
1206 components are easy to solder for beginners. 
3528 LEDS are also easy to solder

All boards are powered with CR2032.
Most board have side switch.