Features1With colorful OLED display, rapid oxygen saturation reading. 2Alarm limit can be set manually, meeting different demands. 3Automatically power off when no signals after 8sec, convenient to use. 4Four directions display by manually changed, you can adjust according to your need. 5Accurately monitoring even in low perfusions 0.4%; Audible, visual alarm and low voltage indicator are available.SpecificationCondition: 100% Brand NewItem Type: Fingertip Pulse Oximeter Material: ABSBlood Oxygen Saturation (SPO2) Measurement Range: 35% -99%Resolution: 1%Measurement Accuracy: 90% -99%: 1% 70% undefinedAlarm default value: 110bpmUpper Limit Setting Range: 100-250bpm,Lower Limit Setting Range: 15-95bpmPulse Rate (PR) Alarm Limit Setting: Stand-Alone: 5Blood Oxygen Saturation (SpO2)Alarm Limit Setting: Stand-Alone 1Battery: 2 x AAA Battery (Not Included)Instructions:1. Install the battery.2. Fully insert your finger into the rubber channel, and then release the clamp to start the test.3. Don't shake your hand when measuring, otherwise the measured value will be unstable.Package List1 x Fingertip Pulse Oximeter