This is a GE/Marquette Mac Vu Interpretive EKG machine for 12 leads real time Electrocardiographs. This model has on screen visual of your EKG's so you are able to get the highest quality EKG's in the shortest amount of time. No more running a strip to find out that the electrodes are not placed correctly or the patient needs further prep. The Mac Vu operates from AC power or an internal battery. This unit comes with the GE/Marquette AM-4 Acquisition module that acquires the data from the patient through leadwires connected to the patient by electrodes. This unit amplifies, filters, digitizes, and performs processing on the signals acquired from the patient.