Amazon is reportedly developing a range of hardware products including an audio-only device that streams music and two smartphones.

The devices could launch in the next few months, though there’s no guarantee that they won’t be shelved, according to a report in the Wall Street Journal.

The phones are said to include a high-end one with a glasses-free 3D screen, as well as another about which details were not included.

The rumored 3D device is said to use retina-tracking ...