The egg on the left i used the egg piercer and the egg on the right i was not using the egg piercer.
How to use it?
Place the egg vertically on the egg piercer and press the button to pierce the egg. Make sure the egg has been pierced.
I like this tool so much as i don't need to place salt while boiling the egg (this is the traditional way). Moreover it's so easy and looks nice... I'm still have not come across this tool in Malaysia. Maybe you could get it from outside the country :->