Plays different tunes to let you know how your egg is cooked. So easy, just pop it in the pan of cold water with your eggs and it will do all the timing for you - with musical entertainment!! I know that the first round of "Take me out to the Ball Game" that my egg whites will be firm and the yolk is perfectly viscus (sorry, couldn't think of a better word!)- By the end of "Hail, Hail, the Gangs all Here"- my eggs are perfectly hard boiled- never a ring around the yolk. My egg has lasted with lots of use for over 2 years.I purchased the same beep egg in Switzerland, and it lasted for 5 years. Then I bought this one here on Amazon, and after 6 month it just stopped working, even though the warranty says 2 years. Maybe the in-built battery was very old... They just sent me a free replacement - hopefully this will last much longer!If it lasts for many years, then I love the beep egg.This product is quite interesting, but for the price, does not deliver an easy use experience. There are so many different songs in different levels, that do confuse a bit. Also, although you wait for a specific song in a specific level, eggs wont come out the same way each time.Me encanto,justo lo que necesitabaWorks as described. Eggs came out perfectly cooked. Just started using it, don’t know how long it will continue to sing.Great Gadget. My son uses it all the time for eggs with Ramen. You just need to keep the gadget in the fridge so it is the temp of the eggs.We bought a second one after the first one stopped working in 6 months. Didn't realize there was a warranty, but the paper work was discarded upon receiving the package. Am very disappointed of its performance and quality.DO NOT BUY this product, you will only be throwing away your money.I love these eggs! Cook perfectly every time. Remember to keep the egg with your eggs in the fridge!Great way to boil eggs! You know exactly when to remove egg. This is my secret bd ‘singing egg’. First one lasted 6+ yrs