Beside the USB cable,the NXT have the Bluetooth function.With this, you can make a connection to PC to download your program unto NXT.If you rich enough to buy another NXT, you can connect up to three NXTs to give more abilities to your robots.Besides you can control your robot from PC,you also can use other Bluetooth devices like Handphones, Wiimote etc.
To learn how to use the Bluetooth, just read the Lego Mindstorms User Guide.
Can't connect to the NXT Bluetooth device?Read next how to connect NXT Bluetooth device to the computer.
The problem is