A watch for blind people

The Bradley Timepiece, a watch designed for blind people, which allows blind people to tell the time by feeling a metal ball in a circular groove. There are no numbers. Around a groove in the centre a ball-bearing rotates to mark the minutes. Around the edge of the watch, another ball bearing rotates to tell the hours(second pic). Designed by Hyungsoo Kim. The watch named the Bradley, here was an appeal on Kickstarter, the crowdfunding website, in July last year - 3,681 people from 65 different countries backed the project, donating a total of $594,602. It will be available for sale from May in the US, with the UK and Europe likely to follow later.