•   32-bit ARM7 microcontroller
•  256 Kbytes FLASH, 64 Kbytes RAM
•  8-bit AVR microcontroller
•  4 Kbytes FLASH, 512 Byte RAM
•   Bluetooth wireless communication (Bluetooth Class II 
V2.0 compliant)
•  USB full speed port (12 Mbit/s)
•   4 input ports, 6-wire cable digital platform (One port 
includes an IEC 61158 Type 4/EN 50 170 compliant 
expansion port for future use)
•  3 output ports, 6-wire cable digital platform
•  100 x 64 pixel LCD graphical display
•   Loudspeaker - 8 kHz sound quality. Sound channel with 
8-bit resolution and 2-16 KHz sample rate.
•  Power source: 6 AA batteries
 A rechargeable battery pack is available for the 
NXT on www.shop.LEGO.com.
Make a program with real sounds and listen to 
them when you run the program.
The battery icon displays the power level of the 
NXT. When battery power is low, the battery icon 
will ash on and off.
When your NXT is turned on, the running icon will 
spin. If the running icon stops spinning, your NXT 
has frozen and you will need to reset it (see page 
60, Troubleshooting.)
You can change the name of your NXT by going to 
the NXT window in the software. This window is 
accessible from the Controller. NXT names can be 
at most eight characters long.
Orange button: On/Enter
Light grey arrows: Used for moving left and right 
in the NXT menu. 
Dark grey button: Clear/Go back
Push the dark grey button repeatedly until you 
see the screen on the right. 
Push the orange button to turn off your NXT; 
push the dark grey button to go back to the main 
menu.
Your NXT has many other cool features. Read 
more about them on the following pages.