http://www.amazon.com/gp/product/B01GR46AVU
I love this tiny little speaker. It has a power button on the bottom, it really doesn't have volume control, you have to do that through your phone. It has a rubber ring on the bottom to keep it from slipping. For the size this one is absolutely awesome. It's loud it's totally easy to use even comes with a little plastic Jack to plug into your phone to carry it around with. It's very compact. It also has a pretty good range for the Bluetooth option.