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Question: Versatility of AL IMO620

1. How does this device perform in outside (open areas), i.e., how far does the sound carry, etc?
2. I understand that it is portable and plays up to five hours on the battery but can it also be used with the power cord plugged in or is that only for recharging the battery?
3. Is the battery life affected by the volume? and
4. How long does it take to recharge?