It would be portable and you can install it on SD card, USB, Phone, PC, etc.
The way it works is in several layers of protection:
Layer 1: 1 BTC or less - Password Protected
Layer 2: 1.000001 - 4.99 BTC - Password and PIN Protected
Layer 3: 5 BTC or more - Password, PIN, and 2 Form Authentication
Whatever media you decide to install the software on would be offline, which means almost impossible for anyone to steal your BTC.
If you want to send, all you'd have to do is insert your USB, SD, etc. into a phone or computer with an internet connection. Then just remove it when you're done.
Just curious if anyone would be interested in this or if anyone has any suggestions to make it better.
These aren't the full details, but more of an overview.
That is a good idea but it will not attract many users. But perhaps some will be using it. You need to market it online and you will need advertisers that has catchy pick-up line that will be attracted to use your product. Without advertisement your product will just stay on your hands. You just need to expose it so more will know and some will buy.