It's being called 'the Fitbit for the blind'
                                
                                
                                    (Newser) -
                                    A man who recently lost his vision says a new device, which lets the visually impaired navigate via sonar, could be "the Fitbit for the blind,"  Ars Technica  reports. The Sunu Band, which was released in August, is a wristband that emits a high-frequency sound wave that bounces...