I have installed new batteries but the device still does not turn on. What could be the problem?

The battery placement for oximeters is different from others. Even though the two springs are on the same side, the two batteries are still required to be installed in opposite directions. The diagram shows correct batteries placement. One product image shows the batteries' installation.  If your device still does not work, Please contact the manufacturer to receive a free replacement.

Does it measure the heart rate?
Yes, this device would measure heart rate along with blood oxygen levels.

Are Facelake pulse oximeters latex free?
Yes, Our pulse oximeters are latex free. The hypoallergenic finger chamber is made of medical grade silicone. 

Does this pulse oximeter have an alarm?
No, This pulse oximeter does not have alarm, Our FL100 pulse oximeter has an alarm.

Does this product ever need recalibration?
The finger pulse oximeter does not need any calibration. However, if you have any issues with the device, please check the user manual and Precaution or contact us. We will be more than happy to further assist.

What kind of battery does the Facelake pulse oximeter use?
The Facelake fingertip pulse oximeter uses 2x AAA alkaline batteries. 

Can I use your facelake pulse oximeter during sleep?
This pulse oximeter can not be used for continuous monitoring, and it does not have a memory to save the readings. It will give you a reading as long as you have your finger inside the finger chamber but . Once you take your finger out, the pulse oximeter will turn off after 5 seconds.

How to change the display direction?
It is auto-rotate.

Can the readings be seen in the sun?
Yes, color OLED.