As international aid agencies rush food, water and medicine to Haiti's earthquake victims, a United States group is sending Bibles.

But these aren't just any Bibles; they're solar-powered audible Bibles that can broadcast the holy scriptures in Haitian Creole to 300 people at a time.

The Faith Comes By Hearing organisation says its Bible, called the Proclaimer, delivers "digital quality" and is designed for "poor and illiterate people".

It says 600 of the devices are already on their way to Haiti.

The Albuquerque-based organisation says it is responding to the Haitian crisis by "providing faith, hope and love through God's word in audio".

The audio Bible can bring the "hope and comfort that comes from knowing God has not forgotten them through this tragedy," a statement on its website says.

"The Proclaimer is self-powered and can play the Bible in the jungle, desert or ... even on the moon!"

Tens of thousands of Port-au-Prince residents are living outdoors because their homes have collapsed or they fear aftershocks following Wednesday's quake.

- Reuters