They are excessively small for the ages indicated. I have bought 2-4 and 4-6 and they don't fit my two-year-old, let alone my four-year-old. Maybe they have big heads, I don't know... I can't use them anyway.

It does not have the same craftsmanship as the first series, which is 9+. The arm connection is made of metal, so if it turns upside down, it will break. Additionally, they come in a fake cardboard box, and there is no case inside, not even the simple one that the first ones have. It does not have a cleaning cloth either. And the last problem is that, although it has the hole for the rubber band attachment on the headpiece, it is not included. I don't know how 2-year-old babies - assuming they want to say that it is for ages 2 to 4 - will keep them on their heads.