This is one of my favorites. A mobile boombox with tremendous sound that syncs through Bluetooth with your smartphone. The great thing about this is that it works for several hours on one battery charge and can sync up to two devices simultaneously. You can also use it as a speakerphone for your cellphone if a call comes in while you are jammin out.
It can be found at the usual online places like Best Buy or Amazon but I got this one from the Verizon Wireless store. It retails for around $100.00. Click HERE for more info.