Fitness tracking ring created by American firm

A startup in California, US, has created a smart ring that works like a fitness tracking gadget.

The Startup is called Motiv and the ring can track the activity of the wearer. It can measures steps taken, calories burned and distance covered. It can also keep track of activity, heart rate and sleep.

The data can be shared with an iOS app.

The ring has a battery life of five days once it is charged for 90 minutes.

The ring is waterproof and comes in seven sizes.