AIY Vision Kit is completely hackable:

• Want to prototype your own product? The Vision Kit and the Raspberry Pi Zero W can fit into any number of tiny enclosures.
• Want to change the way the camera reacts? Use the Python API to write new software to customize the RGB button colors, piezo element sounds and GPIO pins.
• Want to add more lights, buttons, or servos? Use the 4 GPIO expansion pins to connect your own hardware.
• A model based on MobileNets that can recognize a thousand common objects.
• A model for face detection capable of not only detecting faces in the image, but also scoring facial expressions on a "joy scale" that ranges from "sad" to "laughing."
• A model for the important task of discerning between cats, dogs and people.

https://aiyprojects.withgoogle.com/vision#assembly-guide-5-turn-on-the-device-and-connect-to-it

https://developers.googleblog.com/2017/11/introducing-aiy-vision-kit-add-computer.html