S2 MIDI is a wireless, fMRI peripheral device for S2 System. 25 Full size keys mechanism was designed analogically to that encountered in majority of MIDI keyboards available on the market and it is combined with dynamic sound articulation. Each event from the keyboard is timestamped by a hardware clock with 1ms accuracy. S2 MIDI Keyboard if free of any ferromagnetic elements, which makes it safe for use in MRI scanners environment.