NeXus-4 is a truly portable system that supports 4 inputs channels for: EEG, EMG, ECG, EOG, BVP, Skin conductance, Respiration, Skin Temperature and HR (heart rate). Apart from the wireless 'real-time' data link to your computer, you can also store up to 24 hours of physiological data (depending on the batteries) on it's built-in flash memory. This system is so small it fits in your pocket!