I got this for a 6 year old, and she loves it. Nicely boxed, but comes without batteries, so I put the batteries in and taped one coin of each denomination on a piece of card to put inside. As you put the coin in the metal bar in the coin slot presumably 'knows' what size it is, and shows the current addition plus the running total of what should be in the jar. There's also a re-set button to start the balance from scratch, so as well as encouraging saving, I can also see that it would be a good (and educational!) game to get all the coins out and play with different combinations. Coins are easily removed by unscrewing the lid of the jar. Jar is plastic, not glass, so may scratch, but that's too early to tell yet. Perfect present for boys or girls.