content: I have had a poor experience with this product. I have gone through two units, experienced the same problems with each. Operations (with either battery or ac plug) experienced "freeze up" with both players. Once this occurs, all functionality ceases - including the ability to simply turn the unit off. Rio customer service response to two e-mails was a "standard" boiler-plate of solutions to possible problems. No response was made to the lock-up of the system.Ultimately, I returned the replacement player and will seek another vendor. This one did not prove to be worth the aggravation. Maybe I just got a couple of bad apples.