The link to that product is model number: 859GL-80NP/C but you need model 859GL-80NP/C/T (the "T" standing for touchscreen.
On another model, they show this difference:
http://www.sm160.com/Company/Product...-0016-165.html
Quote:
629GL-70NP/C: VGA input, AV input
629GL-70NP/C/T*: VGA input, AV input, Touchscreen
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