Main model can be seen here: http://www.sunglassesitaly.com/fr/Productsview/7244.html (colour: MNC). And they're auto-shade, if that's the expression.
Why 3 for 1? Because they all give you two pairs for the price of one, and now even three... As law forbids to sell stuff under the cost price, that just means that they sell the spectacles at least three times the price!!!