The Dopplex D900 is a low cost audio only, non-directional Doppler, principally used for ABPI measurements by community nurses and doctors in their role of leg ulcer management. Clear audio sounds of blood flow or fetal heart. Enhanced battery management. Compatible with the complete range of vascular probes. When used with Easy 8 probe it is excellent for the infrequent user in locating brachial and pedal arteries. Large carry bag. Headphones included. 5 year warranty. Please specify probe size upon ordering: 2, 3, 4, 5, 8 or 10MHz.