Raspberry PI 3 requirements

Software requirements

1. Raspbian Stretch Desktop
2. 256MB of GPU memory (configure Memory split via raspi-config).
3. At least 8GB SD card.

Hardware requirements

1. USB Sound card with microphone input + microphone (if you want to use voice commands)
2. Bluetooth 4.0 USB dongle (if you want to use HFP/A2DP bluetooth features)
3. Official Raspberry PI power supply or any other stable power supply with at least 2A current.
4. Touchscreen or mouse (if you want to use touch feature)
5. Keyboard (if you want to use buttons)