<b>Why choose our finger oximeter?</b> <br>WRINERY’s Oximeter Finger is a device designed to provide an accurate reading of your blood oxygen level and pulse rate from your fingertip in 8 seconds. <br>Are you ready to achieve the good lifestyle you’ve always wanted? Our pulse oximeter with case won’t let you down. <br><br>Easy to Use – Simply place your finger inside the chamber of the machine, press the operating button, and then wait. Within seconds, you’ll have an accurate reading of you SpO2 levels and pulse rate.<br>Accomodates wide range of finger sizes -- finger chamber with smart spring system. Works for ages 12 and above.<br><br><b>Reasons for Inaccurate Reading</b> <br>When your blood perfusion level is low, the Spo2 pulse oximeter might have a hard time registering an accurate reading; <br>We suggest that you warm your hands and fingers before taking the measurements (You can do this simply by rubbing your hands together); <br>Following that, please also ensure that you keep your hand still because any movement can cause the device to reset its reading; <br>Nail polish and false fingernails may also cause false readings. <br><br><b>Troubleshooting</b> <br>Back case (battery cover) not stay closed? The original design was considering help user to open the battery cover easily. Try to put the two batteries in the battery cabinet and you will find the battery case stay more closed than no batteries in it. If this doesn’t help, just contact us through Amazon’s platform for further solution.<br><br><b>Portable and Easy to Carry</b> <br>1 x Finger oxygen and heart rate monitor <br>1 x Lanyard <br>1 x User manual <br>2 x AAA batteries<br>1 x Protective case<br>1 x Hook