NSDTâ„¢ uses the audio channel of a mobile phone to transmit secure, encrypted, transaction data through sound waves.
Our French partner has posted few videos on web:
http://www.dailymotion.com/tagattitude
 Definitely it will simplify your understanding.
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TagPay 1200: Â the smallest POS terminal ever
This new terminal has been designed to complete the TagPay POS range. Its primary target is the Top-up business. It is small, it is handy, it is secure and it can instantly replace the old fashioned scratch cards.
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 Here is the “loud Speaker” side !
The official TagPay launching will be [...]