The ergonomic design and three-key operation make this unit comfortable to hold and easy to use. Equipped with auto-shutoff feature that conserves power if the unit is disconnected from the patient. Operates on four AA batteries. Ear Clip Sensor and Finger Probe styles available. Finger Probe available in Adult, Pediatric and Infant sizes. Oximeter Padded Carrying Case helps keep your equipment protected and ready to go when you need it most, sold separately.