Playaway has the equivalent of a CD for the eBook contained inside. Some Public libraries offer this service for audio books. The unit is palm sized and only weighs 6 oz. It uses one user replaceable AAA battery which lasts about 20 hours. Bookmarks are supported on some models.
Buttons include: Play/Pause, Power on/off, Equalizer, fast forward, reverse, narration speed (shuffle for music), volume up, volume down.