Features: It is small, light and easy to carry Accurately measures spo2 value and pulse rate Lcd display of spo2, pulse rate and pulse intensity by bar-graph Automatic power-off if finger off longer than 8 seconds More than 50 hours continuous working time with 2aaa alkaline batteries Low battery voltage indication Features: It is small, light and easy to carry Accurately measures spo2 value and pulse rate Lcd display of spo2, pulse rate and pulse intensity by bar-graph Automatic power-off if finger off longer than 8 seconds More than 50 hours continuous working time with 2aaa alkaline batteries Low battery voltage indication