Mobile phone pendant: Create a small and cute mobile phone pendant, such as a small animal. There is a miniature camera and a small screen on the pendant. After connecting to the phone's Bluetooth, the child takes pictures of trees, and the data is transmitted to the mobile phone app for analysis and processing. The results can be viewed on the phone, and brief information can also be displayed on the small screen of the pendant, allowing it to be used with the phone anytime when going out.