The Pencil:
Ting has a pen with batteries and the associated charging equipment, Tip Toi must feed them with batteries.
The Ting-pen is a little too high tech for very small children. Here you should really consider the 4-year limit since the Ting pen can also be used as an MP3 player and the fingers rumdrücken on the various buttons without meaning to.
Since the TipToiStift acts robust.
The Ting pen is very accurate, the Tip Toi "plays" with us different sounds of exfoliated side until he has what you wanted. Also, I find weak that the sounds are repeated relatively at different things displayed on the page.
The coronation, however, that the 5th page, we can not use at the airport book by Tip Toi because the pin here simply "hang" so you have to remove the batteries and only then can restart. Further inquiry still unsuccessful at Ravensburger after 10 days. We will give starter and airport book well back.
The farm book from the starter set is also available for younger children (our 2) a highlight, because the sounds of the animals and tractors are great. The airport book offers only half as much noise.
For a 4-year old child, I would always buy Ting, also because you can use a very long time, the system yet. Who wants to make even small children happy, because it's all about the noise, then tip Toi is also ok, if you always have batteries.