If you've seen one Bluetooth speaker, you definitely haven't seen them allImage by Sarah Jacobsson PurewalPortable Bluetooth speakers can be a tough sell; they’re just not “must-have’ accessories for most people. If you’re not wearing headphones, your phone’s internal speaker is probably fine—unless you’re having a party, or something. That’s why the Bluetooth speakers we saw on the CES floor this year are full of features you didn’t know you wanted: They’re waterproof and rugged, lightweight and portable, and full of flashing lights and colorful LEDs. Some have impressive battery life (50-plus hours), while others can sync up with a theoretically infinite number of other units for the ultimate surround-sound experience.To read this article in full or to leave a comment, please click here