OXIMETER, PULSE SMARTHEART ECONOMY (48/CS) Accurately measures oxygen saturation of arterial hemoglobin and pulse rate Accommodates a wide range of fingers sizes, circumference approximately 20–75mm, user weight approximately 33 lbs ~ 242 lbs (15KG~110KG) Large LCD display with red digital readout Displays Blood-Oxygen Saturation (SpO2), Pulse Rate and Pulse Bar No prescription required Low battery indicator Includes: Pulse oximeter, lanyard, two AAA batteries and detailed English/Spanish instructions