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Hydna Tech Demo This is a tech demo brought to you by https://www.hydna.com It demonstrates how to connect pair two devices over near ultra sonic sound waves. The two devices then connects to a mutual Hydna channel and start to transmit data. In order to run this demo: * Navigate your cell phone to http://hydna.github.io/pair-demo * Check that your ear phones are unplugged and that the silencer is off. * Start listening on your computer by pressing the "listen" button below. * Touch the screen on your cell phone in order to start to send signals. * Put your cell phone close to your computer. Disclaimer: Please note that this technic is unstable on many devices (due to hardware and browser vendors). This demo is not intended to be used in production. It rather demonstrates the possibilities of using ultra sonic sound as a possible way when pairing. Firefox has a limitation when dealing with hi frequency sounds. The application checks if hi frequency sounds can be received before start, so please check that the volume on the computer is on.