Peri DuoFor years, we've been restricted to the iPhone's loudspeaker if we forgot, or couldn't bring along, a separate Bluetooth speaker. No longer. The Peri Duo is a slim iPhone speaker case that connects over Bluetooth or Airplay to play your tunes. It has its own battery, which lets you take off the case to use as a standalone Bluetooth speaker if you so wish. You can also multicast your music to several Duos for a more powerful sound
