The Onyx Studio 4 Portable Bluetooth Speaker offers two device connections, 8 hours of playtime and Harman Kardon Connect+, which allows you to connect 100+ speakers with the same feature with the touch of a button. Rounding out the Onyx Studio 4 offerings is a built-in microphone with Voice logic, echo and noise cancellation for crystal-clear conferencing over the speaker. -Blutooth -Black -HD audio