Micro Mech To MDB Conversion Kit W/Credit Card Interface. Allows you to easily convert any micro/dummy mech machine (12 or 15 pin) to MDB. This is the least expensive kit in the industry to allow your machines to take a credit card reader or PayRange device. Note: You will have to tap into the 24 volt coming into the machine and splice a couple of wires. Please call us if you need any technical support with this kit! Tested and working.