Mirametrix S2
Hardware Specifications (no longer sold)
The Mirametrix S2 Eye Tracker is a small USB device that takes less than a minute to set up. The eye tracker equipment sits unobtrusively below the monitor, facing the user. The small and light hardware package makes the eye tracker system easily portable between machines or locations. The fact that it does not require a custom monitor or embedded computer allows it to run entirely on existing hardware, keeping costs down and allowing the flexibility of monitor choice. (Integrates with iMotions but no longer sold).
The Mirametrix S2 eye tracker is compatible with the iMotions Screen-based Eye Tracking Module.

The iMotions Eye Tracking – Screen-based Module
Main features
With the iMotions Screen-based Eye Tracking Module, you can collect and analyze data in controlled lab environments using world leading, research grade trackers from hardware providers such as Tobii, EyeTech, Smart Eye, SMI, and Gazepoint. The Module allows for advanced analysis using tools such as heatmaps, gaze replays, and areas of interest (AOI) output metrics like time to first fixation & time spent. iMotions also provides automated gaze-mapping technology, in which gaze from dynamic environments is converted to static scenes for simpler aggregation and analysis.