Bluetooth module HC-06 with serial port has the following specifications::

Model: JY-MCU-HC-06

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