How is the Kinect different from every smartphone, tablet with microphones and cameras that we all always carry around even to bathrooms, bedrooms and confident

How is the Kinect different from every smartphone, tablet with microphones and cameras that we all always carry around even to bathrooms, bedrooms and confidential meetings? > $100 more expensive than PS4. You get the easy to use Kinect voice control and things like fitness games that can help you be in your target heart rate zone.