Features:Multi-Colour TFT Display - 4 display modesBig-font display, digital display and plethysmogram display.Direction change manually according to patient observe needs.Audible alarm function, Alarm lamp display and heart rate pulse synchronizationLow power consumption, 50 hours continuous to work.Low voltage warning indication in the visual windowAutomatic power off when no signals for 8sSmall and light weight, convenient to carry. Technical Specification1、Display type: Multi-Color TFT display; 1 inch2、Spo2 measurement range: 35%-99% PR Measurement range: 30-240BPM3、Resolution: ±1% for Spo2; ±1BPM for Pulse rate4、Accuracy: ±1%(90%-99%) ; 70%-89%,±2%; unspecified(≤70%) for spo25、Low perfusion: ≤0.4%6、Power: Two of 1.5(AAA Size) alkaline batteries8、Power consumption: