Made in United States
.77ï¼ LCD screen FHR measurement and display range: 50 BPM ï½ 240 BPM (BPM: beats per minute) Resolution: 1 BPM Accuracy: ± 2 BPM Rated working voltage: DC3 V Battery type: two 1.0 millimeters (H) x 99. With easy and convenient operation it can be used in hospital clinic for daily self-check by pregnant woman realizing early monitoring and care for life.