It's a sixteen key keypad mounted in a small project box, which is powered 
either by a 9volt battery, or by the power inside the rig, which allows for 
direct frequency entry, cw read out of frequency, and mode, and on some rigs 
other things, which attatches to many rigs via their computer port.  The 
current and most commonly used one is the millenium qsyer, made and 
distributed by John Hansen, W2fs, at his website, <coastalchips.com>  /where 
manuals, instructions, etc, plus contact info and instructions for ordering 
are plainly shown.  You'll also find some info, if memory serves, on the 
<icanmakethisthingwork.com> site.

The units sell for $95Built and shipped, and for less in kit form.  If 
you're actually blind, and this is your first purchase of one from him, he 
sells them for $50.  You can use one key pad with several different Icom, 
Kenwood, and Yaesu rigs, using different baud rates and rig identifyers as 
you switch the unit between rigs.  John Hansen, is quite a fine fellow, with 
a real concern for blind, and other operaters.  The units are not only handy 
for blind folks, but as direct entry and frequency read out devices for 
folks operating mobile or portable who don't want to have to look at their 
displays.  I've had and used several, and currently have one which is 
invaluable for use with my Yaesu FT-817, which, although not a truly blind 
accessible rig, nonetheless, with this device can be made to be a very 
desirable somewhat blind accessible portable qrp rig.  (I know, some folks 
hate Yaesu, and they should and could make their devices more blind useable, 
but they make pretty good gear despite its' rightly perceived lack of blind 
accessibility;  *************************I M H O!!! And I've been wrong 
plenty of times before!!!  HTH, Danny Dyer, Wb4idu.