Power supply: AA battery (battery not included) Ultrasonic frequency: 2.5 MHz Display: 40 mm x 25 mm LCD screen FHR measurement range: 65-210 bpm FHR resolution: 1 bpm FHR accuracy: ± 2 bpm Ultrasonic output power: < 30 mW Dimensions: 13.2 x 6.3 x 6.3 cm Safety type: Type B application part
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