Most of the product can apply code, it will not work if you see this message "Product is not eligible for voucher" in product details.
You have to test and try it yourself.
It would be better if you raised your question in this thread, where you can get more details on Gemfive, 11street, Qoo10, Zalora, etc.

To answer your question, it stated clearly that "Not applicable on mobile/tablet" and "Product exclusions will apply" when using code SEPT15, do check again the product you order is within this group?