The NeXus-10 is a versatile and integrated system for measuring a wide range of physiological signals simultaneously. It is suitable for measuring a wide range of physiological signals simultaneously. NeXus-10 offers up to 4 channels of brain actitivy or muscle activity as well as up to 4 additional channels for peripheral signals like heart rate, relative blood flow, skin conductance, respiration, temperature, and more. It also has an extra input for triggers and one input for digital sensors.Bluetooth enabled. Great Mind Media customer support.Good condition, all sensors work. Great portable biofeedback/neurofeedback device!