The oximeter accommodates different sizes of fingers, ensuring that anyone can use the product regardless of their finger size. It also comes with a long battery life, automatically powering off after 10 seconds and allowing over 30 hours of continuous monitoring on one set of batteries. The package includes Fingertip Pulse Oximeter, neck/wrist cord, case, user manual, 2-AAA Batteries, plus a no-hassle 1 year warranty and friendly customer service. The offer on Amazon also comes with a 100% Money Back Guarantee for unsatisfied customers.