On a recent trip to a convention in San Diego, something exciting happened.
I bought a T-shirt from a vendor, handed over my credit card, and instead of using a regular card reader, the seller pulled out a smart phone with an oval device plugged in the audio jack. He quickly swiped my card through it, handed it back along with his phone, had me sign on the screen using my finger, and asked me to enter my email or cell phone number if I needed a receipt—all that, in a matter of seconds...M O R E
How This Device Can Boost Sales of Any Business | How Life Works
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