Features:1. Advanced auto-correlation algorithm for high FHR accuracy2. High sensitivity wide beam integrated sensor for reliable detection throughout pregnancy3. Active noise reduction for crystal clear fetal heart sounds4. Low ultrasound output dosage for ultimate safety5. Advanced power management for long battery life6. Elegant and compact design for easy home useSPECIFICATIONS:Degree of protection against electric shock: Internal Powered Equipment, Type CF Applied partDesigned and tested to meet: IEC60601-1, IEC60601-1-2,IEC60601-1-4,IEC60601-2-37 Dimensions (H*W*L): 125mm x 48mm x 32mm Weight: 80g (including batteries)