MD800 is a small hand-held ultrasound transducer used to detect the heart beat of a fetus for prenatal care. Expecting mother and family can hear the baby's heartbeat from as early as 10 weeks without professional training. Accurate Measurement Professional Guarantee 1. 2.0 inch TFT screen displays FHR value, fetal heart waveform; 2. Three measuring modes: Real-time, Average and Manual Counting; Innovational Design Exhibit Quality 1. Built-in speaker and sound output interface; 2. High sensitive ultrasound probe with 2.0MHz(3.0MHz optional); 3. Detection and Indication of probe off; 4. Adjustable brightness & Volume; Ultra-long Standby and Portable 1. Low power indicator; 2. Automatic power-off;