Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: Is this speaker a good one and how long does the battery last up too?
Document: We bought two of these, one for my 5 and 2 year old, for Christmas. I didn't expect a lot, but I was completely blown away by the sound. We were looking for something that allowed us to use a USB for the music. The battery seems to last for a long time, though I can't say for how long.
good product - while the battery doesn't last that long - that is only negative of product - recommend purchasing
You can't go wrong buying this speaker. I bought 2 more after testing all it's functions. Plenty of volume for your average private space. Easy to take along anywhere, and plays for over 3 hours. Mine plays back the music in the same order that I transfered to my SD card or USB micro flash drive. With the charger hooked-up it works without the battery, no worry about overcharging the battery. With a replacable battery this player will last me a long time.
Great affordable speaker! Worked really well and is easy to use right out of the box. It has a bit of a cheap look and feel to it and I have a feeling it may not last too long, but it's been great for the few weeks we've been using it so far. Sound quality is good and surprisingly loud for its size.
Nice powerful little guy. The battery doesn't last long, but can be recharged using USB cable.
Excellent! Money well spent. Use at work mostly. Battery doesn't last long, but for the money, great bargain. blah blah
This radio is great to have for a work radio. The battery doesn't last long on the radio side but It has been beneficial in keeping me grooving while working. Recommend buy for anyone looking for a small wireless radio.
A "mini boombox" that you can plug in to or bluetooth to from your mobile device. Bluetooth connected easily and works as promised. FM receiver not really usable, but that's not what I bought it for. Uses BL-5C Li-ion cellphone-like battery (3.7v, 850 mAh) that works for a few hours at least at reasonably loud volumes without recharging (haven't tried it longer so don't know how long it will last); battery recharges from USB using included cable.
I'm a tech freak that loves Bluetooth and great deals! THIS LITTTLE GUY PUTS OUT PRETTY DECENT SOUND FOR ITS SIZE. IT IS PERFECT FOR THE BATHROOM, GARAGE OR ANYWHERE YOU GO. Easy to pair! Simply turn ON and your good to go. Also has speaker phone for phone calls. Battery last all day too.
Great product, I needed speakers that would work well with my Nexus tablet, did not want to spend too much; for about 20 dollars its a steal. Works great with my Android phone too. And it hold its charge for a long time.Please note that this is a regular speaker, if you want a high end more expensive one, then this isn't the right one for you. But if you just need a speaker for a tablet/phone/PC, it does a good job.
Answer: The speaker is good for the price. And the battery has lasted up to 8 hours for me