The LISNR® Radius® SDK does not record any audio. LISNR® technology utilizes bandpass filters around the frequencies of interest and all other frequencies (including voice) are rejected. An audio buffer is used to detect the LISNR® Radius® Tone, and this buffer gets overwritten constantly and is never stored.

The Radius® Sample Application (Android and iOS) has the ability to record audio for debugging purposes. This is separate functionality from the Radius® SDK.