[Perfectly Synced Visual-Audio] The Avantree Oasis Plus is aptX Low Latency certified. When (and ONLY WHEN) used with a Bluetooth headphone/speaker that also supports aptX Low Latency or FastStream, it will deliver the ultimate no lip sync delay experience, ensuring perfectly synced visual and audio no matter what you watch. [Works Alongside your Speaker] The Pass-Through or Bypass feature of Oasis Plus guarantees simultaneous audio output through the headphones (that are connected to Oasis Plus) AND your external TV speaker such as Sound Bar or Stereo AVR, so other household members can still hear the TV while youre using the headphones.