The Dynarex ChoiceMMed™ Finger Pulse Oximeter – 7088 is specifically designed for the most effective and comfortable spot checks or continuous monitoring of patients.  This product is a convenient, noninvasive measurement method to detect hypoxia with simple one-button operation. Drop-tested, durable and moisture proof, the Dynarex ChoiceMMed™ Finger Pulse Oximeter – 7088 is suitable for finger thickness of approximately 0.37-0.86 inches (9.5 – 21.9mm) and is powered by two (2) AAA batteries (included).