Premium materials and versatility, the Onyx Mini is a high-performance portable Bluetooth speaker that delivers Harman Kardon’s distinctive sound and design. Rechargeable battery can play for up to 10 hours Wireless Dual Sound allows you to wirelessly connect to another Onyx Mini or Wireless Dual Sound compatible speaker for immersive sound. With the built-in microphone speaker that uses noise / echo canceling technology, you can clearly hear conversations on the phone.