Bluetooth module HC-06 with serial port has the following specifications::
Integrated antenna and complete RS232 interface, with MAX3232 circuit.
Requires a 5 volt@40 ma voltage in pin 7 of DB9 connector.
Default speed: 9600 bps.
Class: 2, 10 meters range.
Protocol: RFCOMM, known also as serial port emulator.
Easily connected to a mobile phone via the bluetooth link.
Replaces the serial cable, with a wireless bluetooth communication link, without the need to modify previous microcontroller programs
Bluetooth HC-06 module with serial port easy guide.pdf
Electronic diagram of Bluetooth HC-06 module with serial port
Video: installing and testing a Bluetooth wireless link
Project: wireless Bluetooth module with serial interface
How to configure Bluetooth HC-06 module with AT commands
Bluetooth control of Bolt 18F2550 from a mobile phone