High pressure, low pressure, pulse results showed. Low battery detection function, promptly remind users to charge. Blood pressure classification indicator, the health of the blood pressure response. Can store 99 sets of measurement results for two people. Automatic shutdown in 1 minute without operation, saving power. Unit conversion: Blood pressure Kpa/mmHg conversion (power-on default unit mmHg) Error prompt: Easy for users to find the cause of the error. Overpressure protection: Exha