... wave’s intensity display: 6-segment bar-graph display Low battery voltage indication: Segment LCD Signal2, Measuring range: SpO2 display: 50 ... : 30bpm-240bpm, Resolution: + 1bpm3, Power supply requirement: 1.5V(AAA size) alkaline battery x2 Battery voltage: 2.6V—3.3V4, Operating current: < 10mA5, Resolution ...