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Swipe (audio-jack) card reader - Shopify Help Center
https://help.shopify.com/en/manual/sell-in-person/hardware/card-readers/audio-jack-reader
Install the Swipe (audio-jack) card reader Steps: Make sure that the volume on your device is set to maximum and not set to silent. If your device's volume isn't at maximum, then the card reader won't be detected. Plug the card reader into your device's headphone jack.
Audiojack Reader | FEITIAN
https://www.ftsafe.com/Products/Card_Reader/Audio
A professional of security devices and solution provider includes software protection dongle,OTP,PKI ePass token, Smart Card, Smart card Reader and Mobile banking devices. Feitian assists you to build your own security in the field of e-banking, e-commerce, e-government, and software protections with high secure, flexible and affordable features.
IDTech API: Requirements
https://docs.kioskgroup.com/api/peripherals-idtech-api-requirements.html
If using an encrypted reader, this API returns the information as both a masked plain-text string and an encrypted string. In this scenario, you would be responsible for sending and decrypting the string. For more information about the IDTech card readers supported, visit IDTechProducts.com. Specific Volume Settings (audio jack card readers only)
monodevelop - Xamarin API to read audio jack input ( like ...
https://stackoverflow.com/questions/23922783/xamarin-api-to-read-audio-jack-input-like-square-cc-reader-bluetooth-conne
Does Xamarin has API to read audio jack input ( like Square CC reader ) & bluetooth connectivity? Thanks.
Audio Jack Card Reader SL110 - stronglink-rfid.com
http://www.stronglink-rfid.com/en/rfid-readers/SL110.html
Audio Jack Card Reader SL110. SL110 connects with Apple IOS, Android mobile intelligent terminal platforms through a 3.5mm headset audio port, with advantages of plug-and-play, small size, low power consumption, built-in rechargeable battery and ultra-low-cost, etc. It's easy to carry, truly realizes reading the HF tags "anywhere, anytime, as ...
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