The number means that they will be at your disposal 24 hours / day, 7 days / week. And JAV means that fucking hot type of adult clips featuring busty little asian sugar babes. It's a porn tube with a weird motto: "Sex and Run". WTF? Run where? And why?
It looks good. The layout I mean ... It's not one of a kind or anything, but it's clean, easy to be used and you will have all their options a few clicks away. I guess that the homepage starts with their latest updates, but I'm not 100 % sure. A few lines of thumbnails will show you what they have and underneath you will see the menu that you can use in order to see more and more. Unfortunately, like on many other porn tubes these days, you will have no previews if you will stick your mouse pointer on a screen capture.
It seems that you can filter the content by censored and uncensored JAV. Use the navigation bar for that. Also, still there, you will have a button for HD materials. The sidebar shows some top additions, but the algorithm used there is a mystery to me. Do it, enter JAV247.