It's from Texas Instruments and is a $50 TI-Nspire product voucher so you get to pay fifty dollars less when you buy any TI-Nspire products. Redeemable only at Learning Interactive Pte Ltd and IT EXPIRES ON 31 DECEMBER 2009! In other words that's 4 more days before it's invalid!!! I don't have any opportunity to use it so im gonna sell this at about $25-30? You can use it to buy graphic calculators or smth~~Anyway the price is negotiable so please please contact me by email [email protected] or pm me!~ HURRY! <33