The FingerSAT Sport Oximeter is a small and durable oximeter that is designed for active individuals and requires no prescription. This oximeter has a one touch display system and is wrapped in a durable silicone housing for protection. Completely self contained, and requiring no external devices this oximeter is truly a single product solution. An advanced display shows backlit OLED for easy viewing in dim light and multiple colors to help clarify readings and one-touch adjusts the display's size and orientation. This device requires one triple AAA battery (included) and weights approximately 1.6 ounces.