Fingertip Pulse Oximeter MD300-C1, FDA 510K Approved! MD300-C1 is intended for noninvasive spot-check measurement of function oxygen saturation of arterial hemoglobin (SpO2). Widely used in family, clinic and hospitals also the sport market. SpO2%, PR are displayed on screen. Simple and convenient operation. Light, compact (the weight is 50g including batteries). Low power consumption, two AAA batteries can be continuously operated for 30 hours. Indication of low power consumption. Includes: Model MD300-C1 Oximeter, Lanyard Cord, Instructions, 1 year manufacturer's warranty, 2-AAA Batteries Ideal for Aviation, Sports, Mountain Climbers, Walkers. FDA 510k Authorized. LED Viewing Screen with Pulse Rate, SPO2 and Bar Graph Low Battery Life Indicator 'All-in-One' Integrated Finger Oximeter Simple Operation for immediate, real-time spot-checks. Reliable Accuracy and Durability, Automatic Power Off Design 1 Year Manufacturer's Warranty