Sun bracelet measures UV exposure
30 July 2014 Last updated at 00:01 BST
French company Netatmo has developed a bracelet designed to protect you from the sun.
It is not sold in traditional jewellery shops - instead they are selling it through Apple Stores, and online.
The June device communicates via Bluetooth with your mobile device, to give alerts about how much sun you are being exposed to.
The BBC's Dougal Shaw tried out the device during one of the hottest days in July (the 18th) in the UK - and kept a video diary.
He also met up with Raphaelle Raymond of Netatmo to quiz her about the device.