Install / setup.
The extension is set as a normal Joomla plugin through Joomla extensions installer.
After installing the plug-in list will JoomShopping plug - Attribute CheckBox, in the settings which can be set to display whether the attribute information if it is not selected.
How to work with the addon.
1. You need to create an independent attribute to select the type "checkbox"
2. attribute to create two option NO and YES
3. in the products to set the attribute value of each option. (Always add both NO and YES, there is NO place for +0 and for YES to put the needed rule of price)