The Blue Jay Blue Bear Fingertip Pulse Oximeter for Children uses cartoon design to reduce the anxiety in young children. It’s small size and lightweight design will not cause too much pressure on children’s fingers.   Product Features: OLED screen with 4-direction display Pule bar, Plethysmogram Parameters; SpO2, PR Low battery prompt – Takes 2 “AAA” batteries (included) Pediatric pulse oximeter can be used on the finger thickness between 5mm-19mm