The new MD800 Fetal Doppler offers a small, portable & easy to operate unit with a user-friendly interface. The TFT screen displays fetal heart, fetal heart rate waveform, volume & battery status. It benefits from a high sensitivity ultrasound 3MHz probe and a built-in audio speaker. The fetal heart rate measuring range is 50bpm-210bpm with a heart rate accuracy of ±2bpm. The MD800 Fetal Doppler is supplied with 2 x AA batteries and a 1 year guarantee.