Full Details from Amazon.com : http://www.amazon.com/gp/product/B00005JGD2?tag=onigi-20<br /><br />Hewlett Packard 82215A 128 KB RAM Card for the HP 48GX<br /><br />128 KB RAM memory card <br />Compatible only with the HP 48gx calculator <br />Powered by its own long-lasting battery <br />Can be added to the main memory or used as an electronic disk <br />A quality HP product
