The first one sent had letters on the keyboard that were dead (2,w,d,c). After a hard time getting hold of anyone at PB Tech I eventually got a replacement issued. The new keyboard keeps not typing letters unless you stabbed the keyboard very hard with every letter. It also did multiples of the same letters i.e. "sssssss". It ends up with unintelligible sentences with multiple mistakes that then have to be manually corrected. I am no longer using it as it is (again) unusable and not worth the price or the hassle. Utter rubbish.