How is the reader powered? Their copy on the home page (as well as in the video) says:
"Read payment cards from any device with an audio input jack, including your mobile phone."
From the image on their page, the reader is using a 4-pole 3.5 mm plug, which might mean it's powered from the host device. If not, I guess it needs a coin cell which would have to be replacable unless the entire reader is disposable.
I searched for a pin-out of the headphone jack, and it seems the 4th pole is for the microphone which (of course!) is used to send the credit card data. Is their app playing some sound, thus allowing the reader to power itself from the audio outputs?
"Read payment cards from any device with an audio input jack, including your mobile phone."
From the image on their page, the reader is using a 4-pole 3.5 mm plug, which might mean it's powered from the host device. If not, I guess it needs a coin cell which would have to be replacable unless the entire reader is disposable.
I searched for a pin-out of the headphone jack, and it seems the 4th pole is for the microphone which (of course!) is used to send the credit card data. Is their app playing some sound, thus allowing the reader to power itself from the audio outputs?