When I ordered this speaker, I thought it would be much bigger than it actually is. Turns out it is only about 6" wide by 1-1/2" square. When I got a small package I thought, "Uh-oh! What did I order?!" I envisioned little, tinny sound. Well, have I been pleasantly surprised! This little guy puts out a big, full bodied sound. Not thumping bass, mind you, but still clear sound, with a rich sound and very good frequency range. Plus the speaker is solidly built.As far as battery power, I've had the speaker 3 days and haven't recharged it since the initial charge when I first got it. Still going strong! And I use it all day at work (low volume).The buttons on top are big, so you can turn up or down the volume, pause the music, skip to the next song with out squinting to see the button or fumbling around to find the right button. I slip it in my laptop case to bring to work. I love the sound all day long. Particularly good for the classical music I enjoy.The more I use this product, the more I like it! Even at full volume, this thing makes a surprisingly BIG sound!I have another Bluetooth speaker that I spent $149 for in 2015 (Creative Sound Blaster Roar 20A) and this one is every bit as good, if not better.I recommend this! It is my first Anker product. I'll be keeping my eye on them for the future.