Apple Watch: 11 things you need to know

7. It’s got sensors to keep you healthy

There’s an accelerometer inside and a heartbeat monitor on the back of the Apple Watch, and it’ll draw GPS data from your iPhone. All that goes towards making the Watch Apple’s new fitness tracker. Tim Cook says it’s designed to work as an all-day tracker, and there are two new apps to go with it: Fitness and Workout. You’ll be fed nudges to stand up every so often, and you’ll be able to track distance, calories burned and the duration of your workout.

8. There are lots of apps coming

Among the apps shown at the launch were Twitter, Pinterest, Maps, Nike, a music player (yay, Coldplay!), photos (the Watch can also act as your iPhone camera’s viewfinder) and airline notifications. You’ll also be able to use it to check out your electric BMW’s battery life or wave it in front of a hotel room door to unlock it. Oh, and it works with Apple Pay.

Obviously, we'll have to wait until more developers get their hands on the SDK before we see what's really possible.

9. It’s a watershed moment for wearables

The last time Apple unveiled a wholly new type of product was the iPad launch back in 2010. And we all know how that turned out: suddenly, tablets went from being tech’s white elephant to things that people wanted to own. Today’s announcement is, make no mistake, A Big Deal for wearable technology of all kinds – not just the Apple Watch itself.