Popunder specification differs from the site to site which provide service. Full screen specifications are increasing used for better conversions of the advertisements. Most of the brands use popunders for the advertising of their latest products and the updates in the websites. Yahoo is one of the most famous brands using the popunders as a means of advertising. In the website US Web Traffic, it is possible to get various specifications for the popunder designs. The quality of the traffic that a pop unders can direct is known to all. They show good rate of conversion when using popunders. The full page popunders take more space on the customer’s screen showing more details of the products. When the customer is using a big screen for browsing, the full page pop under would definitely show some difference in the interest of the customer. The choice of color and design of popunder also matters. The full page pop under can include text sections and videos to give more information. Graphics that suit the individual’s interest, pictures that can attract are all elements in bringing the traffic to the desired site. Ad units of any size can help but popunders with full page specifications are the best.