This is certainly not the first audio Bible. There are pocket sized MP3 Bibles like the Go Bible that have been on the market for several years. The solar powered angle, however, is a new and intriguing feature.
The main Bible is known as "The Proclaimer," and their website describes it like this:
We consider the Proclaimer to be a gift from God. Why? Because the inspiration for it came during three days of fasting and prayer by the entire staff of Faith Comes By Hearing. The Proclaimer is a digital player dedicated to playing God's Word in the local heart language.The organization also sells "BibleSticks" - basically MP3 players that contain files for the audio Bible. They currently are marketing a regular version (in white) and a military version (in black).
There are a couple of stories about this on NPR, one for All Tech Considered, and a short blurb from the business news bloc (which was where I first heard about this).
The organization boasts the world's largest catalog of audio Bibles. In looking over their website, they seem to be scrupulous in not letting on their denominational affiliations (although one can discern a bit of this through their links and partners page).
They offer a fair selection of English versions to choose from (including a New American Bible version, which I found surprising at first), as well as a vast array of "heart languages," which are indigenous dialects from around the globe.