CSR is a British chip manufacturer's name abbreviation, blue adapter on the CSR means, this adapter with the CSR manufacturer's chip, is also a manufacturer code name.
Bluetooth module, is an integrated Bluetooth function of the PCBA board for short-range wireless communication, according to the function is divided into Bluetooth data module (such as BLK-MD-BC04-B, BLK-MD -SPP series) and Bluetooth voice modules (such as BLK-MD-SPK series).
Bluetooth modules are generally composed of chips, PCB boards, and peripheral devices. Such as BLK-MD-BC04-B Bluetooth module has CSRBC4 Bluetooth chip, MX Flash Flash soldered to the 4-layer PCB board, while the PCB board integrated 2.4G printed circuit board antenna, using printed circuit board antenna cost-effective. And some modules will have RF amplifier, such as BLK-MD-BC04-L long-range Bluetooth module.
Expanded Information:
Classification of Bluetooth Module:
1, Bluetooth Module According to the chip manufacturer BroadCom Bluetooth module, Dell Bluetooth module, CSR Bluetooth module;
2, Bluetooth module according to the use of Bluetooth module data Bluetooth module, serial Bluetooth module, voice Bluetooth module, Bluetooth module in the car;
3, Bluetooth module according to the power of CLASS1, CLASS2, CLASS3;
< p>4, Bluetooth module according to the application and support protocol is mainly divided into classic Bluetooth module (BT) and low-power Bluetooth module (BLE);5, Bluetooth module according to the protocol support is divided into single-mode Bluetooth module and dual-mode Bluetooth module.
Baidu Encyclopedia - Bluetooth Module