Apple Watch Series 4: Apple's new smartwatch is here to save your life

The new smartwatch has a more refined design and will keep you fit and healthy

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The Apple Watch Series 4 is official, and has just been unveiled on stage at the Steve Jobs Theater on Apple's campus in Cupertino.

It's the biggest update to the Apple Watch since it was first released in 2015, with an updated design and new version of WatchOS.

Does this mean it'll be a smash hit? Let's take a look at everything Apple has changed…

At first you might not even notice the new design, it's a subtle, but significant update. The screen has grown by 30-percent and the bezels have shrunk, making the watch appear much more modern.

There are also small changes to the buttons – the power button is now solid-state (meaning there are no moving parts) and the crown on the cellular model now sports a simple red ring rather than block circle.

The rear is made from black ceramic and sapphire. It not only looks good, it also allow for more stable Bluetooth and 4G connections.

Just like before there are two sizes, but models are now called 40mm and 44mm, and a range of colours, new straps, and faces to choose from.

Of course, the Apple Watch can do everything you'd expect a smartwatch to do, from receiving notifications and calls right on your wrist, to fitness tracking.

As we expected, the Apple Watch Series 4 has a big focus on fitness, and is able to offer even more workouts than before, such as yoga, and hiking.

Electrodes in the heart-rate sensor and digital crown turns the Apple Watch into an (FDA approved) ECG, sending an electronic pulse through your body, allowing you to create a detailed picture of your heart rhythm, which can then be shared with your doctor.

With the 4G model of the Apple Watch, you can leave your iPhone at home without the worry of missing anything.

The watch will also use Siri to keep track of your schedule, acting as a digital assistant on your arm, briefing you about all of your events and reminders for the day.

You'll also be able to use Siri to send messages, set reminders and begin alarms all using your voice.

The Apple Watch Series 4 runs WatchOS 5, bringing the ability to compete with your friends on a fitness leaderboard, new workouts (such as Yoga), a podcast app, and Walkie-Talkie function.

It's a great update, and will also be available on older devices on September 17th.

Unlike Samsung, which has managed to achieve a week-long battery life, the Apple Watch will most likely need nightly charging (or every other night).

Prices start from $399 (£399) or with cellular $499 (£499). You can pre-order the watch on Friday, and buy it in store the following Friday.