Eye tracking technique	Video-based pupil and corneal reflection eye tracking with dark and bright pupil illumination modes. Two cameras capture stereo images of both eyes for robust accurate measurement of eye gaze and eye position in 3D space, as well as pupil diameter.
Eye tracking mode	Tobii Pro Spectrum has four different eye tracking modes for different groups of primate species: Human Great ape Monkey Small monkey
Sampling frequency	60 Hz, 120 Hz, 150 Hz, 300 Hz, 600 Hz, or 1200 Hz (max. frequency depends on hardware version)
Precision¹	Head supported² 0.01° RMS at optimal conditions (applying Savitzky-Golay filtering, settings listed in the test report) 0.06° RMS at optimal conditions (raw signal) Head free-to-move³ 0.02° RMS at optimal conditions (applying Savitzky-Golay filtering, settings listed in the test report) 0.08° RMS at optimal conditions (raw signal)
Accuracy¹	Head supported² Down to 0.16° Median: 0.30° (P25: 0.24° - P75: 0.41°) Head free-to-move³ Down to 0.17° Median: 0.43° (P25: 0.32° - P75: 0.59°)
Binocular eye tracking	Yes

Eye tracker latency	Mean latency < 2 ms @ 1200Hz (SD < 0.2 ms)⁴
Blink recovery time	1 frame (immediate)
Gaze recovery time	Less than 150 ms
Data sample output	Timestamp Gaze origin Gaze point Pupil diameter
Eye openness data stream	Eye openness stream has the same frequency as frequency selected for the gaze stream and will have the same timestamps. Eye openness data is provided in millimeters, for each eye individually.
Eye image data stream	Eye image stream frequency is approximately 10 Hz (one image with both eyes). Zoomed-in eye images available in tracking mode. Full-frame camera images are available in gaze recovery mode.
TTL input stream	8–bit timestamped data (256 event codes) Event driven detection with a timestamp accuracy of 50 µs
Tracker and client time synchronization	Integrated between the eye tracker time domain and the client computer time domain with an accuracy of 100 µs
User calibration	Binocular, Monocular

Optimal screen size	Up to 24" (16:9 aspect ratio)
Recommended monitor	Supplied 23.8" monitor
Tracker setup options	Eye tracker unit can be used alone or together with the monitor or other screens. Can also be used with real-world stimuli. Tracker mounted on stand, allows for even larger screens and physical objects to be tracked.
Participant setup	Very simple and easy. Typically, less than 1 minute.

Dimensions (L x H x W)	55 cm × 18 cm × 6 cm (22" × 7" × 2") The eye tracker is mounted on a stand, which raises it from the surface by 9 cm (approximately 4")
Weight	5.1 kg (11.4 lbs.) With the power supply unit, the weight is 5.7 kg (12.9 lbs.)
Connectors	TTL input: 8-bit (DB-9 connector) Communication: Ethernet (RJ-45 connector) Power supply: 24 VDC (5.5 mm connector)
Data Processing	Fully embedded data processing

Eye tracking cameras	N/A
Illuminators	Dark pupil illumination modules Bright pupil illumination modules
Power consumption	Typical power consumption: 60 W Max. rated power consumption: 96 W
Power options	Input: 100-240 VAC 50/60 Hz Max. rated power consumption: 120 W No load power consumption: <0.15 W Energy efficiency level: VI Complies with EISA 2007/DoE, NRCan, AU/NZ MEPS, EU ErP, and CoC Version 5

Connectors	DVI VGA HDMI Display port 1 port for monitor control (USB 3.0) 2–port USB hub (USB 3.0) C13 power connector Audio input connector: 3.5 mm Headphone jack: 3.5 mm
Built in speakers	1.0 W + 1.0 W
Power supply	100-240 VAC 50/60 Hz
Power	Max. rated power consumption: 42 W Typical power consumption: 13 W Power Save Mode: 0.5 W Power Management: Power Save (VESA DPM, DisplayPort -Rev 1.1a, and DVI DMPM)

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