Features: The fingertip oximeter can be used to measure human haemoglobin saturation and heart rate through finger. Widely used in hospital, home healthcare, oxygen bar, community medical centre, alpine area, sports healthcare, etc. Reliable accuracy and durability. Low voltage indicator, low power consumption. Small and light weight, convenient to carry. Automatic power off in 8 seconds when no signal. Small and light weight, convenient to carry. Notice: For detailed instructions, please refer to the user's manual first. Specifications: Item Type: Digital Finger Oximeter Color: Green, Purple, Pink, Blue, Gray(Optional) Function: Measure human haemoglobin saturation & heart rate Battery: 2 x 1.5V AAA batteries (not included) Quantity: 1 PCS SPO2: Measurement range: 70% - 99% Accuracy: ±2% (70% - 99%), unspecified(≤70%) Resolution: ±1% PR: Measurement range: 30BPM - 240BPM Accuracy: ±1BPM or ±1% (select larger)