Fetal heart tone doppler Features: Large LCD display Low ultrasound power, safer to the fetus High sensitive probes with wire or wireless Rechargeable battery for long working time The same advanced fhr algorithm with that used in fetal monitor. Two speakers for good sound quality Adult nibp and spo2 are options Options: Thermal printer can record fhr waveform Nibp and spo2 functions Dimension(cm):23*18*13 Package(cm):30*24*24 N.W/g.W: 1.5kg/3kg Pcs/ctn:4pcs/ctn