The Porti™ is a multichannel amplificator for biomedical signals (EMG, ECG, EEG). It is equipped with monopolar and bipolar channels, for a total of 32 channels. It includes also 4 auxiliary channels to acquire other sensors such as electrogoniometers, accelerometers, etc.. The system does not filter the signals (there is only an anti-aliasing filter) but it allow the acquisition of a signal with an excellent signal to noise ratio. The system can be used both in static and dynamic conditions. It can be powered by batteries or DC.