Samsung is due to release a Galaxy ring, and there is unsubstantiated speculation that Apple is considering a ring too. The short answer is that they are likely to fulfil the same health and activity tracking as a watch, leaving your wrist free for a more fashionable or traditional timepiece. But they can also track the your body’s movements much more precisely than other wearable technology. This could allow you to control and interact with other technology in new ways – but also raise even more concerns about privacy.