From Rhythm Software:
THIS APP WILL NOT LAUNCH BY ITSELF. This is payment module ONLY for applications published by Rhythm Software. Donation record is bound to your Google account. That means if you have multiple devices using the same Google account, you just need to donate once and enjoy ad-free versions on other devices. If you have donated using the same Google account before, you can click "Reactivate Application" menu item in your application to enable ad-free version without donate again. You can uninstall this module freely after donation. Features: Use Android Market In-app Billing service to offer payment support, which is secure and official supported by Google. Help to reactivate application when re-install or phone reset. Thanks for purchase.