What makes this personal digital assistant suitable for the blind? It has a Perkins-style keyboard. This keyboard, designed by David Abrahams in 1951, has 6 keys that represent each of the six dots in the braille code. Any of the characters in the braille code can be produced through pressing different combinations of these six keys. Software on the Voicesense include a word processor, an email application, a media player, MSN Messenger, and others. The PDA has 1GB of memory and is even Bluetooth compatible.