AV-ACE Hand Held Pulse OximeterFeaturesLCD display with backlight controlDual work modes: monitoring & spot checkNumeric display with plethysmogram displayTrend reviewPulse-tone modulation (Pitch Tone)Adjustable audio and visual alarmsPowerful data storage capacity (up to 300 hours)PatientCare Viewer software for PC data management 4 x AA batteries for up to 48 hours of workRechargeable battery for up to 30 hours of workOptional battery charger standAutomatic power-off function for power saving