All the Power and Versatility of the Real Estate Master IIIx calculator – on your Android Smartphone. And while perhaps obvious, if you change from an Android device to an iPhone or iPad, you WILL need to buy a new license as they are incompatible. • All the real estate and finance functionality of the Real Estate Master IIIx calculator • No learning curve -- just one powerful, easy-to-use calculator app • Full User's Guide built in as well as ability to press and hold a key for specific help