Texas Instruments TI-15 Explorer Elementary Calculator<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Amortization - No; + /- Switch Key - No</li><li>Backspace Key - No</li><li>Base Number Calculations - No</li><li>Bond Calculations - No</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51909aphZVL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/516MEr6pFVL.jpg" noproxy>