Reading accurately and reliable：this bluetooth pulse oximeter accurately measures your blood oxygen saturation levels(spo2 ), pulse rate, pulse strength and pulse waveform and display them conveniently on a large screen, please note that there is a protective film on the screen, you can tear off the protective film before use to better see the screen numerical value Warnings for abnormal readings：when you measuring, if o2 level value or pulse rate value exceeds the preset limit, the value which exceeds limit will flash on the screen, keep an eye on your spo2 and pr With bluetooth function：record and store a reading up to 10 hours continuously, view real time data, graphic report and trends of blood oxygen saturation and heart rate, bluetooth oximeter will self switch off when a finger is removed from the unit for more than 10 seconds Easy to use：bluetooth pulse oximeter can perform all operations with one button, simply clip it on to your finger and turn it on at the press of a button, this bluetooth oximeter lightweight and small size means it can be easily carried in your pocket, easy to carry You will get：1x bluetooth pulse oximeter, 2 x aaa batteries, 1x lanyard, 1x user manual