The TB-03F-AT_Mesh with SMD-22 Bluetooth Modules ROHS is a Bluetooth module manufactured by Ai-Thinker. It is an incredibly small and compact module that supports Bluetooth 4.0 protocol and can be integrated into a variety of IoT applications. It features a 2.4GHz radio transceiver, and supports up to 200 meters of connection range. It also supports GAP, GATT, and Mesh protocols to enable features like broadcasting of device information, bi-directional communication of information, and mesh networking. The module is made to be highly energy-efficient while still maintaining a secure connection, and supports advanced authentication methods to ensure security. The ROHS compliant module also has FCC, CE, IC, and Bluetooth certifications.