RS3 NFC Setup is a free app developed by Restock.com for Android devices. It is designed to be used with the idChamp Bluetooth Smart (BLE) NFC reader/scanner firmware version 2.0 or later and Android 4.4 or later (with working BLE stack). The app is used for setting up NFC for various card types such as iClass, PROX, ICODE, MiFare, AWID, and more.

The app allows users to quickly and easily change settings such as selecting card type, setting up card hold time, and controlling Wiegand bits output format. Users can also strip leading and trailing bits, enable/disable FAC (Facility Access Code), reverse/invert Wiegand bits, and set delimiters for character(s) sent before and after each scan when using the RS3 NFC reader in keyboard simulation mode. All settings are stored in the RS3 unit flash memory, ensuring they are persistent.

Overall, RS3 NFC Setup is a useful app for anyone using the idChamp Bluetooth Smart (BLE) NFC reader/scanner with firmware 2.0 or later on their Android device. It provides an easy and efficient way to set up NFC for various card types and customize settings according to user preferences.