features：
display: oled screen
direction: four directions display
accuracy: spo2: 70%~100%, ±2%
pulse rate: 30~99bpm,±2bpm; 100~250bpm,±2bpm
bat tery: aaax2
dimensions: 64.0x37.7x36.5mm
weight(without batteries): 42.2g
parameters: pulse rate,spo2
indication: real-time battery statues,weak or unstable signal,
value limit remind
application range: adult,adolescent,child