Portal is basically just a tablet with a good speaker and a very good camera. To activate it you say, “Hey Portal”. The gadget comes in two formsa 10-inch screen that looks like an Echo Show ($199) and Portal + ($349), a pivoting 15-inch tablet that’s affixed to a stand. Users can move around, grab a glass of wine, cook dinner and the camera will follow them, zooming and panning to keep users in the frame.