FD-100 Digital Fetal Doppler Ultrasound Sound Baby Heartbeat Detector Monitor LED Digital Prenatal Pocket Fetal Doppler Stethoscope (Pink), FD-100 (Pink)Features 1. Battery status indicator. 2. Check the battery at low power. 3. Built in speaker. 4. Headphone output. 5. The probe can be changed. 6. Probe inspection. 7. Backlighting. 8. Automatically shut down. 9. 2xAAA1. 5v alkaline are available and can work for no less than 10 hours ((excluding battery) Packaging 1 x fetal Doppler 1 x English manual 1 x Headphone line Specification: General Certificate CE, ROHS Package Weight One Package Weight 0.