User Manual Philips BT2500B/37 wireless portable speaker Audio

Full volume gets you about 3 hrs. Note: this is full
volume. Half volume 4 to 5 hours but after having this
speaker about 2 yrs. I'm getting about 3 to 4 hours half
volume before it won't produce any more volume. Of
course you can a adjust your volume on your sound
source and it will get louder.

Yes, it has a plug-in for headphones or direct connection to
a mp3 player. It does not come with the cord. It's perfect
for travel, using it in hotel rooms. Not loud or clear enough
for beach use unless you are close to it.

The literature from Philips does not mention it one way or
another. Given that they have higher end models in which
they do mention it I would assume that it does not have
one. It has great reviews and is regarded well for the price
and size.