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LISNR

https://lisnr.com/

LISNR is the global leader in ultrasonic proximity technology. Via a secure and scalable Radius SDK, LISNR sends micro-communications using sound waves between any device that has a speaker and microphone. With advanced data-over-sound technology, businesses can unlock the potential of every on-prem and digital interaction through seamless, scalable, and secure proximity detection, contactless transactions, and proximity marketing, delivering personalized, intelligent, and dynamic experiences that drive revenue, engagement, and loyalty.