ACT (Artery Check Technology) analysis the pulse and SpO2 signals and determines the actually prevailing stiffness of the artery (Artery Condition).ACT further comprehensively classifies the arterial condition into 6 levels and presents the result by an intuitive graphical visualisation. Pulse rate,SpO2 and the artery condition are available at your fingertip! Features: Artery Check Technology (ACT) embedded Instant readings of SpO2, Pluse Rate, and artery condition in 1 minute Big 2.4" color TFT display Personal SpO2, Pluse Rate, Memory Intercal thresholds setting Shielded Design blocks Ambient Light Biocompatibility & Anti-Allergic Design Alarm function - Device delivers audible warning when measurement result exceeds the SpO2/Pluse Rate thresholds previously set. Silent mode - Disables the beep sound during the measurement by pressing the "Sound" button. Up to 999 Memories. Could be programmed with 3 intervals: 10/30/60 seconds Bluetooth Transmission Pulse Strength Indicator Dual power source Protection pouch Specification: Measurement Range: SpO2: 35%~100%; PR: 30~250 bpm Precision; SpO2: 70%~100%; ±2%; 35%~69% (unspecified); Pulse rate: 30~250bpm; ±3 SpO2 Accessory: Adult Probe Included, Pediatric / Neonatal Probe Optional Power Supply: 4 x “AA”Alkaline / AC Adaptor