if you want a keyboard for you calculator , this be you only option . it have all the letter , but it lack other button such as some for programming which give the keyboard limited functionality . it also come with some nice software that be like notepad for calculator so you can save and manage you file . it be pretty easy to set up , you just have to download a new operating system for you calculator . overall good accessory for every calculator finatic , somewhat pricey , but again , its the only one