Ideal for use in multiple applications: hospital, nursing home, community medical treatment, home care, sports center, etc.. Portable noninvasive spot check oxygen saturation and heart rate. Oximeter uses two AAA batteries and conserves power by shutting off automatically when no signal is detected: It can be used up to 30 hours before batteries need to be changed out or recharged.. Displays digital SpO2 and pulse rate while using bar graph technology to monitor heart rate. LCD display mode.