This block is analog of Cart button block of woocommerce.
It renders a special block (better to use in the header) where the user can see a number of items in the cart.
Click on the cart button will open the sliding panel. You can also enable the sliding panel to open on every “add to cart” click on the site.
Additionally, this block has the option to attach free shipping and Quantity inputs
You can style block with your design in header, it can be formated as button or as text. All values are synchronized with cart of site in live mode.