Digital liquid crystal,date and time alarm bell display Automatic memory storage, it can store 74 units of measuring figures max Pressing the storage key, it will show the average value of three lately testing. Manage by mmHg/kPa displaying. Turned off automatically two minutes late. Technic parameter Display mode: LCD digital displaying Range Press: 0 280mmHg(0 37.3kPa) Pulse: 40 200/min Precision Press: ±4mmHg(±0.5kPa) Pulse :within the readings ±5% Automatic press-adding and decompressing For arm of 22cm 32cm Electric source: 4 batteries of size 5, DC 6v/600mA