Looks just like a Verizon XV6600 that I had several years ago. Sure hope the battery life has improved! I know there are a couple used ones for sale on eBay if anyone wants to try one out. It was my first touchscreen PDA and it ran Windows Mobile. The slider worked well too whenever I got tired of the onscreen keyboard. This isn't innovation. This is copycat, plain and simple. Maybe the Audiovox design patent expired?
Here's a link: http://www.phonescoop.com/phones/phone.php?p=570