Features: 1. Accurate and reliable measurement. 2. Optical frequency conversion technology. 3. Simple operation and low power consumption. 4. Measuring body temperature. 5. Revolved display screen. 6. Take good care of your body、 attentively to protect the future.  Description:   Brand name: Heal Force   Model: Prince-100D2   Power supply: DC 3V(2 X AAA)   Test parameters: SpO2 \/ PR \/ PI   Display screen: 0.9 inch double color OLED display   Waveform display: Blood oxygen volume waveform、 pulse intensity histogram   Pulse frequency: ±2%   Blood perfusion index measuring precision: 0.1%   Accuracy(SPO2): ±2%(75%-100%)   Scene: 4 switch to show support   Warning: Dual alarm sound and light   An external probe: Does not support   Measurement object: 1-8 years old crowd   Size: App 33(W) X 30(D) X 60(H)mm   Net weight: App 60g       Package Included:   1x Host   1x Battery   1x Use manual    Notes:  1. Please allow slight deviation for the measurement data and make sure you do not mind before ordering.   2. The real color of the item may be slightly different from the pictures shown on website       caused by many factors such as brightness of your monitor and light brightness.