Which generation is the Caterpillar reading pen rp-04?

Caterpillar reading pen rp-04 is the fourth generation. According to the inquiry of official website of Shenzhen Caterpillar Technology Co., Ltd., the Caterpillar Dot Pen RP-04 is the fourth generation product of the Caterpillar Dot Pen. Caterpillar point reading pen is an intelligent point reading pen product launched by Shenzhen Caterpillar Technology Co., Ltd., which is mainly used in early childhood education and English learning.