The Luxe 8500i from Equinox Payments is the first point-of-sale terminal to accommodate ultrasonic data transmission to accept payments initiated by a smartphone app from anywhere in the store as well as in the checkout lane. Microphones built into the Luxe 8500i receive audio signals of varying frequencies from a smartphone using a retailer’s mobile app integrated with ultrasonic data technology from Lisnr. That company’s SDK embeds data into sound in a process called modulation. To decode data in the audio signals, the Equinox terminal performs a demodulation integrated into the pa...