Video: http://www.youtube.com/watch?v=0roDvvy0J-8

This head tracker adopts geomagnetic sensor, compare with conventional gyro, it is more accurate and no drift.

Weight: 10g
Dimension: 40 x 28 x 7mm
Power supply: powered from transmitter trainer port (such as Futaba 9 to 12-channel transmitters square trainer port)
Packing method: bare PCB, no outer case/packing
Sensor type: Geomagnetic sensor, 3-axis

Includes:
1 x Geomagnetic Head Tracker
1x cable

Requires:
1 x 2.4G / 5.8G video transmitter
1 x video camera
1x earphone