"In 2008, Lattebox a hi-tech company located in Taiwan, launch a new kind of NXT device, NXTe. NXTe allows controlling RC servos easily. NXT brick has 4 sensor port inputs to control NXT sensors as Ultrasonic Sensors, Compass Sensors, NXTCam Sensors, etc.
If you connect Lattebox NXTe in any free input sensor port, you could manage until 10 RC Servos with your NXT brick with an unique NXTe kit."
- Read more here.