Hello Mark,
Thank you for your review on HearLink.
We're sorry to hear that you've experienced latency causing an echo. HearLink uses aptX technology to minimize latency, so we're curious about your specific use case. Could you please share more details on how you're using HearLink?
If you're using it as the Audio Transmitter (External Mic), please double-press the MF button to enable stereo sound. If you're using it as the Bluetooth Microphone for conversation (Internal Mic), please make sure you double press the MF button to disable the stereo sound for optimal low-latency performance.
For your information, every time you turn on HearLink, it defaults to Bluetooth Microphone mode with optimal low-latency performance, NO need to double-press the MF button.
We've sent you an email with the attachment of 'HearLink Sound Mode Guide' to get more information. Could you please try again, and let us know if the sound latency has improved?
Thank you, Mark, and have a great day!