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Contec New Fetal Doppler Baby Heart Monitor for Pregnant woman Sonoline B 3MHZ Probe Sonoline-B Pocket Fetal Doppler (LCD Display with Back Light) 1 Accurate FHR Detection & LCD Display 2 Easy to Use 3 Auto & Manual Counting 4 Built-in Speaker 5 Automatic Switch-off Main Features 1. Built-in speaker2. Three work modes: Real-time FHR display mode, averaged FHR displaymode and manual mode3. LCD display4. Probe inspection5. Battery status indicator6. Backlight7. Auto Shut-Off : After 1 minute no signal, power off automatically8. Suitable Using Range: Suitable for use after the 12th week of pregnancy9. Two pieces of standard 1.5V alkaline battery available which can work no less than 10 hours10. Output for headphones11. The probe is changeableMain performance 1. Anti-electroshock Type: Internally powered equipment2. Anti-electroshock Degree: Type B applied part3. LCD Di