There are many things to look for in a Bluetooth speaker, but first and foremost comes audio quality, and there are few better in this particular area than UE's line of Boom speakers. They tend to be a bit more costly but you get an excellent quality speaker for the price, and as of now you can pick up the original Boom from UE at just $99 down from the normal price of $199. For half off you'll get a speaker with loud booming audio and the capability to fill the room with rich sound. The UE Boom produces 360-degree audio, and it can be connected up to one other Boom speaker for a more stereo quality if you prefer, making it more immersive.
It's also water and stain resistant thanks to the plasma coated outer material, so you won't need to baby it like you might with other speakers. Thanks to the built-in mic you can also use it for voice calls, and the range reaches up to 50 feet instead of the standard 33 you see from most other Bluetooth speakers. Another benefit is the battery life, as the internal rechargeable battery will last up to 15 hours during playback so you can take it with you and stream music all day, and all night.