It is a wiring block that is used to make explosions and smoke, my favorite :). The wire input is on the bottom of the capacitor, and the gas-spewing output is on the top. The cool thing about this block is that when you paint it a normal color (unless it is glowing, for more info read a little more), it will produce the same colored smoke. Glowing paint however will make the capacitor explode with the following:
Glowing Yellow Paint= New Shock effect, which will cause you hands to move on their own rapidly
Glowing Orange Paint= Destruction Bomb
Glowing Cyan Paint= Freeze Bomb
Glowing Green Paint= Radiation Bomb
Glowing Pink Paint= Impulse Bomb
Please bring this to the top of the suggestions and remember, YEEPS DON'T SLEEP!!!