It is a Personal Sound Amplification Product that allows you to hear your baby's sounds like kicks, movement and heartbeats. Technical Specification: Frequency: 3MHz Intensity: Power supply: Alkalinity battery Display: 45mm×25mm LCD FHR Measuring range: 50~240bpm FHR resolution: 1bpm FHR accuracy: ±1bpm Power consumption: Dimension :135mm ×95mm ×35mm Weight:500g Functions: Type: Continuous Backlight:Yes Build-in speaker : Yes Battery indicator:Yes FHR display: Yes Auto power off: Yes Various work modes :Yes Alkalinity battery:Yes
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