Hi Burce: If you say it works, it WORKS! But I'll bet it comes with a 200 page manual. I buy nothing that comes with a manual, that needs batteries or recquired the use of a screwdrive and other dangerout tools.
IBZT is just a distributor and is not the manufacturer nor the inventor of the virtual keyboard. The one you showed belongs to an Israeli company, VKB, which is privately held.