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@gboyd17 Hi and welcome, In the case of mobile devices the boosters are stored on the device itself, so they are not transferable to another device. You can only use on that device. Also if you every have to uninstall the game on your phone your boosters can be lost
Thank you
Welcome to the King Community.
In the case Phone, your collected booster is stored in phone memory. This stored booster can not be synced with the server, because the game studio still does not have this process.You will not be able to transfer the boosters to another device or even if you have synced between Facebook and Kingdom, Boosters will not sync on both accounts, in the case of Android device.
Thanks!