Hobby project 

With this AIY Voice Kit from Google, you can build a standalone voice recognition system using the Google Assistant, or add voice recognition and natural language processing to your Raspberry Pi-based projects. The kit includes all of the components needed to assemble the basic kit that works with the on-device voice recognition with TensorFlow or Google Assistant SDK (only available outside of the EU). 

Included in the kit:

• Voice HAT accessory board
• Voice HAT microphone board
• MagPi AIY Projects book
• Plastic standoffs
• 3” speaker (wires attached)
• Arcade-style push button
• 4-wire button cable
• 5-wire daughter board cable
• External cardboard box
• Internal cardboard frame
• Lamp
• Micro-switch
• Lamp holder

Necessary items that are not included:

• Raspberry Pi
• micro-SD card
• Screwdriver
• Sticky tape

https://aiyprojects.withgoogle.com/voice/