......
First you have an IR (infrared) technology at the front of the controller and in the sensor bar that detects where you are pointing it (PHOTO PROOF: IR LED's can be seen with a digital camera, but not seen by the naked eye). Like a remote control for your TV, so long as it is within range of the reader, it can tell where about you are pointing it on the screen. But if you get too far from the sensor bar (or too close with the Wiimote not aimed at the sensorbar), it will lose the signal completely. (For you projector owners out there like myself, this means that you may need to mount the reader bar in the center of your screen or on a table in the middle of the room to play it.) The Bluetooth sends what is read between the Wii controller and the sensor bar.
........