The Dopplex SD2 provides bi-directional vascular information to the vascular professional including the display of flow direction. It is ideal for clinical specialists wishing to conduct advanced Doppler studies. It is compatible with all high sensitivity vascular probes. (Audio only with OP2 and OP3) It is best for ABPI assessment and provides bi-directional blood flow information. It has enhanced stereo audio output. It comes with a large carry bag and stereo headphones.