To obtain a multi-site license you must negotiate a special offer with FumitoMIZUNO, the developer of Number Pro Attribute.
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This addon creates a "Number Pro" attribute, an extension for Conrete CMS's standard number attribute.
"Number Pro" attribute allows users to set min/max/step options used in input="number" HTML.
If you are using ver.9 or later, you can optionally add big spinner buttons.
(If you are using ver8.5.7, big spinner buttons are not available.)
When the sales of this addon reaches $1,500, I will convert this addon free and MIT license.