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With Project Ara, Google plans to let users build their own handset out of upgradeable modules.

Now a UK start-up is hoping to take the same approach with a smartwatch, by offering a wrist-worn computer where you decide which hardware it includes.

The Blocks smartwatch will be made of multiple modules – each housing different sensors and add-ons: ranging from a fingerprint scanner to an NFC chip for contactless payments.

The idea is for users to choose the hardware blocks that support the features they want. And if they want a bare bones watch for a lower price then that should be possible too.