Product Details:

Display: LCD Screen
Performance: FHR Value, FHR Mode,
Battery Status Range&Accuracy: FHR Measurement Range: 50-210 bpm
Accuracy: ±2bpm
Measuring Modes: Real-time, Average and Manual Counting
Ultrasound Frequency: 3.0MHz
Dimension: 130X100X36(mm)
Net Weight: 250g
Backlight and Speaker: Backlight, Adjustable Volume
Battery Type: AAx2