dan ackerman is here this morning.ow does it work. >> it's one plastic credit card. i've got one here. you have a card swieb their plugs into your phone like someone using a credit card reader. you swipe it and they length you select anymore this different ways. sometimes you use your home. this one you can tap on the presets. >> oh, wow. how much does that thing cost because we'd have to buy that and does it work on all phones? >> you have to buy the card. there are three or four different companies and the cards have batdryes in them so eventually they'll run down. most are l have iphone apps and android. that includes a lot of people using phones. >> one of the big concerns is security. how secure are these smart cards? >> people are concerned with anything. in this case you're swiping your cards into your own phone and that's where the data is kept. just like apple pay, they will send a temporary number to a vendor or somebody you're buying from and you don't have the card numb borne the card itself. so you have a