Many smart doorbells popular with consumers have tried to bring face recognition to the market, but CNET testing has found that face recognition isn’t that accurate yet. Person recognition—where a camera can tell the simple difference between a person and a dog or a car—has proven a bit easier, and certain cameras can also be trained to recognize individual residents. Face recognition on smartphones is a much simpler problem to solve, as the face is much closer to the camera and can therefore capture nuances.