For Libra tone, Zipp BT was more that producing a portable wireless speaker that could play music from Bluetooth devices. It was about making the best one. From the fashionable Scandinavian zippered Italian wool covers it derives its name, to the Full Room 360 Degree sound from Ribbon Based Tweeters, Zipp breathes quality audio into the air. Digital Signal Processing and Digital Amplification provide a premium sound experience anywhere you desire. The rechargeable battery provides up to 4 hours of wireless playback from your smartphone, tablet or Bluetooth enabled device. A simple color that integrates easily into your life, the salty grey Zipp is your all-around, go-to wireless speaker.