Main Features
Built-in speaker and earphone plug
Three work modes: Real-time FHR display mode, averaged FHR display mode and manual mode
Probe inspection
Battery status indicator
Backlight LCD
Auto Shut-OFF: after 1 minute no signal, power off automatically
Suitable Using Range: suitable for use after the 12th week of pregnancy

Main performance
Anti-electroshock Type: Internally powered equipment
Anti-electroshock Degree: Type CF applied part
LCD Display: 45 mm × 25 mm
FHR Measuring Range: 50 BPM ~ 240 BPM (BPM: beat per minute)
Resolution: 1 BPM
Accuracy: ± 2 BPM
Power Consumption: <1 W
Voltage: DC 3.0 V
Power Supply:TWO 1.5V(AA size) Amazon Basic Batteries
Nominal Frequency: 3.0 MHz
Working Frequency: 3.0 MHz ± 10%
Negative Peak Sound Pressure : P_ < 1 MPa
Ultrasound Output Power: P < 20 mW
Working Mode: Continuous wave doppler

Physical Characteristic
Dimension: 135 mm(L) × 95mm(W) × 35 mm(H)
Weight: About 12 ounces (including batteries)