... modules This design uses CSR'sBluetooth chips, V2.0 protocol standards, industry-standard28mm x 15 mm x 2.35mm, ... a compact, self-efficienton-board antenna, transparent serial port with a variety ofBluetooth adapter, paired Bluetooth mobile phone use, ... . 2. the circuit interfaceRS232 serial port (TTL level), (also equipped with a floor-levelserial portWireless Serial Bluetooth RF Transceiver Module ...