They all use AR technology. The products of the same company include Tu Tu Le Yi Er Chao, Language Card Yi Er, Encyclopedia, dinosaur watching, spelling music and so on. Compared with all kinds of 4D early education products on the market, only AR technology series has the richest content and the highest cost performance. The first type: Neo-Bear, except for a little more advertisements, there is really nothing else, because it is relatively simple, only animal cards. The second kind: the egg gives birth to the world, which is a little better than Neo Bear, covering animals, vehicles and machinery, but only 90 calories. The third type: AR language card 2 has 93 cards in total, which is more comprehensive in design field, and most importantly, it also adds dual-card interaction and game mode. Android and Language Card 2 can also send 8 national languages, which are not available in the first two. The price is similar to that of retail. I hope it helps you. If you are interested, look at my head.