Chronos is a powerful new USB-based response and stimulus device. Chronos allows the accurate collection and verification of tactile, auditory, visual, and analog responses along with providing a precise source of audio and generic analog output timing. Chronos features millisecond accuracy and consistent sound output latency across machines. Chronos includes 16 digital inputs and 16 digital outputs, eliminating the need for a parallel port.

The Chronos system includes a microphone, Photo Sensor, and auxiliary I/O breakout cable (2 digital inputs, 2 digital outputs, 1 analog input, 1 analog ground, power (5 V) and digital ground). The Photo Sensor can be used on CRT, LCD, and projection displays to detect stimulus onset events, refreshes, and measure rise and fall times.