Xiaomi – a fast-growing Chinese electronics firm – has pulled back the curtain on a new flagship handset and wristband. And the two work together in an entirely new way.
You can use the Mi Band wristband to unlock the Mi 4 handset via Bluetooth, so you won't need to enter a passcode. It's a bit like the Touch ID fingerprint scanner on the iPhone 5S, but with a wristband accessory.
The Mi 4 has a 5-inch screen, with 17 per cent higher resolution than Apple's current-gen top-end smartphone, and packs a 13-megapixel camera from Sony.
It's the first metal phone from the company and is powered by a 2.5GHz Qualcomm Snapdragon 801 chip, and 3GB of RAM.
The Mi 4 sells for just 1,999 yuan (£189), and the Mi Band wristband only costs 79 yuan (£7.50).
The Mi Band is water-resistant, can track activity and sleep, and act as an alarm clock.
Xiaomi also announced it has sold 57.4 million smartphones in the three years since it entered the market.
It has been ranked as the sixth largest smartphone vendor, and China's third biggest, behind Samsung and Lenovo.
The company's business model is to offer its handsets at affordable prices by not spending much on advertising, and by selling the devices online.
Its software is constantly being updated, sometimes on a weekly basis. Users can suggest changes, too. And if yours ends up being put into practice, the company will notify you.