Large LCD size : 80 x 72mm;LCD and START/STOP button backlight2x90 groups memory function;Average calculating for the latest 3 times measurement value;Blood pressure classification (WHO) indicator;Irregular heartbeat (IHB) indicator;+Year/month/date/time function;Accuracy :Pressure +/-3mmHg; Pulse+/-5%;Power by DC 6V(1.5V 4Pcs AAA size batteries) Not inclutedAutomatic power-off function.