waveshare Bluetooth 2.0 Slave, UART Interface Bluetooth module for UART interface, slave/device mode TheBluetooth Slave UART Boardprovides bluetooth solution for adding wireless capability to your development system. It is suitable for applications where wireless bluetooth data transmission is needed. TheBluetooth Slave UART Boardworks in slave/device mode. We provide both "Bluetooth Master UART Board(aka, theMaster Module)" and "Bluetooth Slave UART Board(aka, theSlave Module)", each of them works in single mode only. It is impossible to switch working mode for the module. The white spot on the top indicates aMaster Module. For establishing communication, there're something should be noted: it requires aMaster Moduleand aSlave Moduleto communicate with each other