Kickstarter allows you to choose one reward. If you would like to add additional rewards, simply 'up' your pledge. All non-U.S. backers please add the cost for international shipping once for the highest reward only.
When the Kickstarter campaign is over, we will send you a BackerKit survey asking you exactly what rewards you want and verifying your shipping address.
The iOS app works with any device that has Bluetooth 4.0. It will work on the following devices:
iPhone 4S, iPhone 5, iPhone 5S, iPhone 5C, iPod Touch 5th Gen or newer, iPad 3rd Gen or newer (Retina), iPad Air, iPad mini, iPad mini with Retina.
It will not work with iPod Nano, Shuffle or Classic.
Android 4.3 is the first official version that supports Bluetooth 4.0. This is also why it was mentioned in the stretch goal. Pre-4.3 backers, we will try to add support for as many devices as possible. We just want to start with the official one first.
Don't see the answer to your question? Ask the project creator directly.