Hi there,
System already available.
price 10K USD for whole project, it auto convertible, it work with the most 90% POS in the market, no bad swipe when you attach it in POS device and big terminal.
keypad full managed by software ( Admin sofwtare)
all data stored ( date time, card) timestamp ( using external battery.
remotely downlaod the logged transactions (Bluetooth), possiblity to use Mobile phone.
The unit haves protected password.
you can store more than 1K cards.
estimation size 29mmx37mm.
Track2 decode.
if you are serious buyer I think you will carry with me.