Dani88:
so as addictional feature on HC-05 i can set M or S mode, right?
Yes, you can change a HC-05 module to master or slave mode. Just connect it to your computer with a USB serial cable, then connect to the corresponding COM port with a serial console (e.g. the serial monitor tool in Arduino IDE), and send the corresponding AT commands.
The full spec of HC-05 module can be downloaded from the hardware vendor website http://www.wavesen.com/downloadDis.asp?id=30.
By the way, if you don't have a USB serial cable, you can configure your Arduino board to be one, see http://arduino.cc/forum/index.php/topic,18243.0.html.