World’s most advanced ultrasonic audio technology

Send Data Over Audio

LISNR is an ultrasonic inaudible technology; a communication protocol that sends data over audio. We use ultrasonic audio called Smart Tones™ to transmit information.

LISNR transmits customizable packets of data every second that enable proximity data transmission, second-screen functionality, authentication and device to device connectivity on any LISNR-enabled device.

  • Audio Frequency Range: ~ 18.7 – 19.2 kHz
  • Data Transmission: customizable based on use
  • Detection Time: customizable based on use ~ .6 sec – 3 sec
  • Software: C Library base with restful API depending on use


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Enterprise, Commercial Grade
Protocol Features


  • Best-in-Class Data Transmission/Throughput
  • Local Tone Generation via any device
  • Audio Mesh Networking single/bi-directional use


  • Detection time: adjustable based on use
  • Ability to apply 256 bit encryption
  • Offline capability (no data connectivity needed)
  • Tokenization (meta data keys based on use)


  • Battery/CPU Efficiency
  • No hardware requirement
  • Local app/DSP level coding


  • Any device platform functionality (SDK & API)
  • Full customer support team (live & virtual)
  • Cross-device best in class reliability
  • Commercially deployed globally