The Product Slider Extension supports the RedShop component.
Any RedShop you have installed, you don't have to do anything special, just select the RedShop as Slider Type.
The other option is the Theme for the Product Slider. All of the Themes are described under the Slider Themes category here.
Here you are able to setup the type specific settings. These can be different based on which of the type are you using.
Select type parameter will be set the type of the slider. Its selectable values are the following:
If you select this parameter, the category chooser will be enabled right under, and you will be able to select from which categories would you like to show the products.
In this case the special products selected.
The last uploaded products will appear in the slider.
With this selection, the manufacturers will be shown in the slider.
With the Number of products you can set how many items would you like to apper in the slider.
With the Show prices of the products you are able to show/hide the product prices.
Image settings parameter refers for the product images in the slider. Here you can set its dimensions, and also can choose to crop the images, or even extend them with transparent color. You can see the difference on the image below: