BTM-510 Bluetooth Transmission Adapter. This manual is provided to help you understand the correct operation and obtain optimal performance, please read carefully before use. BTM-510 Bluetooth adapter built with our fundamental design concepts for high quality, free of movement, convenient portability, easy to use and low radio interference. Combining advanced Bluetooth technology, BTM-510 is a general wireless audio platform for dynamic and condenser microphones with an appealing appearance. Please make sure the following items shown below are included in the package.