Device for visually impaired

Hi, I am interesting in these products. Has anyone tried them already? They look really attractive and affordable for its price. What’s more important, they are foldable, will fit any backpack, and you can drop them as many times, as you want – and they will still work as new. The manufacturer is US-based, and they also promised a 2-year full warranty for their products. Look at the weight!!! I’ve never saw such light-weighted devices! And, it can be used without a software at all! Some – even without computer at all!!! http://www.abisee.com