Originally Posted by analog

You could set your own timer and just go and tell them when they've had enough. You don't need a device to do it for you.

It'll get turned on, set, and put in the machine, and the parents will walk away and ignore the situation. This is just another thing that will make lazy parents even lazier, and pay even less attention to what's going on.

This needlessly takes away interaction between parent and child, when a lot of kids don't get the attention and interaction they really need to begin with.