Make sure the battery is positive and negative.
Pediatric Pulse Oximeter Heart Rate Stats Monitor Kids Finger Blood Oxygen Saturation Monitoring, Children SpO2 Levels Detection TFT Lanyard & USB (Blue Kids Pulse Oximeter)
Fingertip Pulse Oximeter, x2 AAA Battery(included), Carrier Case & Lanyard, Finger Blood Oxygen Saturation Checker Heart Rate Stats Detection, O2 Monitor Accessories for SpO2 Levels Detector
Pediatric Pulse Oximeter & Storage Zipper Case Heart Rate Stats Monitor Kids Finger Blood Oxygen Saturation Monitoring, Children SpO2 Levels Detection TFT Lanyard & USB (Yellow Kids Oximeter)
Pediatric Pulse Oximeter with Bag Heart Rate Stats Monitor Kids Finger Blood Oxygen Saturation Monitoring Children SpO2 Levels Detection TFT Lanyard & USB (Storage bag with Blue Oximeter)
Medical Temperature Thermomete or Finger Blood oxygen saturation Oximeter LED
Pediatric Pulse Oximeter with Bag Heart Rate Stats Monitor Kids Finger Blood Oxygen Saturation Monitoring Children Oximetro SpO2 Levels Detection TFT Lanyard & USB (Bag with Yellow Toddler Oximeter)
