The big news is built-in GPS and this makes it the very first of Fitbit’s fitness bands to have the technology. When it comes to features, however, there are upgrades and they’re significant. The Fitbit Charge 4 follows a pattern established by the company over the past few years, in that it doesn't look all that different from the model it replaces – the Fitbit Charge 3, which launched in October 2018. READ NEXT: The best fitness trackers to buy today Fitbit Charge 4 review: What you need to know So why would you buy the new Fitbit Charge 4 in the face of an avalanche of cheap rivals from China? Fitbit thinks the addition of GPS and a selection of other features is enough to persuade customers away from the bargain bin. But times, they are a-changing and there are now plenty of firms producing Fitbit-style products that do a similar thing for less cash.

This is the company that turned step tracking from niche pursuit into a global obsession, a metric – much-derided – that underpins the success of the fitness technology industry today. Fitbit was the first big name in activity trackers.

Charge 4 fitbit