Product Details:

Display: LCD Screen

Perfornance: FHR Value, Volume, Battery Status
Range&Accuracy: FHR Measurement Range: 50-210 bpm
Accuracy: ±2bpm

Measuring Mode: Real-time

Ultrasound Frequency: 2.SMHz(3.0MHz optional)
Dimension: 128.5x91.5×37.5(mm)

Net Weight: 190g±5g

Backlight and Speaker: Backlight, Adjustable Volume
Battery Type: 9.6V NI-MH(Rechargeable)or AAx2