YX310 pulse oximeter with Bluetooth

Pulse rate measurement range: 25 bpm ~ 250 bpm
SpO2 accuracy: 70%~100%: ±2%.
Pulse rate accuracy.
±1% / ±1bpm (the result depends on the highest value)
Power consumption at 40mA
Operating environment Temperature (Cº): 5~40
Relative humidity: ≤80%.
Start method: Push-button start
Power supply: 2 x AAA 1.5 V alkaline batteries
Size: 60 × 38 × 35 mm
Weight: 38 g (without batteries).
Automatic switch-off time 8s