The MMBT-S Trigger Interface Box is a virtual COM port (8-bit TTL output) to LPT/parallel port adapter. Package includes the MMBT-S, a USB cable and a USB memory stick with hardware drivers and installation manual. It features an in-built LED visualising odd trigger marker codes (i.e. 1, 3, 5, 7, ..., 255). The MMBT-S works well with NeuroBS Presentation, E-Prime, Inquisit, OpenSesame, PsychoPy and MATLAB.