NaturalPoint TrackIR 4 Ultra Includes both the TrackIR 4 Pro and TrackClip Pro accessory

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

Product includes
# Shipping Box
# TrackIR 4:PRO device (device has 5.5 ft. USB cable)
# 1 Black TrackClip
# 1 Software CD-ROM
# Electronic User's Manual
# Quick Start Guide

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

Bring Head Tracking to Your Headset ::
The perfect TrackIR™ accessory, clips to Creative Lab's and other popular over-the-ear headsets. Combined with a TrackIR, the TrackClip PRO delivers precise 6 degrees of freedom view control.
On your favorite headset, the only thing you will notice about the lightweight TrackClip PRO is your improved gaming experience.
Due to high demand, TrackClip PRO orders may take up to 5 business days to ship.
# Active LEDs for precise tracking
# USB power tap, with USB pass through
# Ultra light weight
# 2 position headset clip (fits over-the-ear style headsets)

System Requirements ::
Requires TrackIR 3 (with Vector) or TrackIR 4 Series hardware
Range 2 to 5 feet (61 cm to 152 cm)
Fits headset bands up to 1 1/4" wide and up to 1/2" thick