NaturalPoint TrackIR 4 Pro Head Tracker (inc Vector)

TrackIR 4:PRO
TrackIR Changes Everything ::
Experience real time 3D view control in video games and simulations just by moving your head! The only true 6DOF head tracking system of its kind. TrackIR takes your PC gaming to astonishing new levels of realism and immersion!
The TrackIR 4:PRO is NaturalPoint's premium product - the best optical headtracking system available.
Put Your Head In The Game!®
# Wider 46° Field of View
# Hyper Fast 120 FPS Sample Rate
# Smaller Sleeker Design
# Resolution Doubling Technology
# Vector Technology

Minimum System Requirements
For Software Version 4.0++ ::
Requires TrackIR 3 Series hardware or later
Windows 2000 / XP / Vista (32 & 64-bit)
Requires DirectX 8 or later
Pentium II 500
5 megabytes of free hard disk space
16 megabytes of RAM
USB 1.1 or 2.0 port

Vector PRO
True 6DOF Head Tracking ::
The Vector expansion, building on the proven and affordable TrackIR technology, takes head tracking to a new level of realism.
Vector precisely translates all head motion into your virtual point of view. Pan side to side, look around, even zoom with full 3-dimensional tracking.
Vector expands your view control to a full range of motion, from 2 Degrees (2DOF pitch/yaw), to all six degrees of freedom (6DOF).
No matter how or which direction you move your head, Vector instantly captures it with extreme precision and accuracy.
# True 6DOF control!
# Totally New Way to Play!
# TrackIR 3 Exclusive Accessory
System Requirements ::
Requires TrackIR 3 Series hardware
Range 2 to 6 feet (61 cm to 183 cm)