3. Plug-In the USB-Serial Cable, and get the COM port numbers in Device Manager, usually it will be COM3/COM4/COM5...
=> Start -> Run -> devmgmt.msc -> OK -> Search Profolic USB-Serial COMx
If you PC/Mac/Laptop are nativly with a bluetooth device,
you don't have to buy it at all.
2. Plug-In the USB-Bluetooth adapter, and usually Windows XP or Latest Windows will be equipped with Bluetoooh driver by default
=> You will see a bluetooth icon in your task tray bar.