... a high performance fetal heart beat detector with color OLED displaying FHR curve,Website:http://www.aeonmmed.com, which ... at home.Features1. Lightweight and Easy-To-Use. 2. Color OLED display FHR value, FHR intensity, speaker volume, battery capacity indicator, ... for manual count mode: 30-250bpmFHR Accuracy: ±1bpmDisplay: Color OLED displays FHR value, FHR intensity, speaker volume, battery capacity ...