Choose the Nonin Onyx for accuracy in challenging patient conditions such as poor blood circulation. With PureSAT technology quickly and accurately captures SpO² and pulse rate measurements. Durable unit which allows pulse oximeter to be used in the most demanding environments. Up to 6,000 spot checks or 36 hours of continual operation. Works on the widest range of patients from pediatric to larger adult patients. 2.2”x 1.3” (5.59cm x 3.3cm). Includes two AAA batteries. 4 year warranty. Latex free.