Certified by the FDA and available without a prescription, this fingertip oximeter instantly and painlessly monitors oxygen saturation and pulse rate without the need to draw a blood sample. Simply clip the device to your fingertip and press a button--your SPO2 and pulse simultaneously display in large, easy-to-read numerals on its OLED panel. The same button cycles between six display modes and adjusts the display's brightness for no-fuss operation. The oximeter can by used by children or adults and shuts off automatically after the user's finger is removed to conserve batteries. As small as an inkjet cartridge, it includes a protective pouch with a belt loop and key ring, and a quick-release lanyard. Includes two AAA batteries; low-battery indicator. 3" L x 1" W x 1" D. (4 oz.)