Features: 2.4" large lcd display Light weight, easy for use Fhr numeric display;optional waveform display Li-ion battery with usb charging port Low ultrasound level, safe to fetus Specifications: Ultrasound strength: < 5mw/cm2 Unit dimension:3(d) * 13(w) * 8.5(h) cm Unit weight: 270g Moq:28pcs/ctn Carton size: 600*50*37cm Carton volume weight: 24kg