Caterpillar point reading pens can be read for the second and third generations, but because they are second-hand, you should be optimistic about the quality and model when buying them.

Use the linked Caterpillar stylus:

1. Log in to Little Douzi APP and click Add Device on the point-reading pen page.

2. Select the Caterpillar stylus and enter the wifi password to be connected.

3. After turning on the point reading pen, press and hold the previous song and the volume+key for 3 seconds at the same time until the voice prompt is received, and the networking is successful.