Features: 1.Lcd size:36*44mm 2.Intelligent automatic measument 3.Who blood pressure classification Display style :digital lcd display Measurement style :oscillography Measurement range: "pressure:(30~280)mmhg Pulse:(40~199)beat/min" Accuracy: "static pressure:+3mmhg Pulse rate:within +5%" Memory: 90 memories Power source: dc3v(2 batteries of aaa type) Operating environment: "temperature:+5¡æ~+40¡æ Hudimity:¡¨¹80%rh" "storage&transportation Environment" :"temperature:-20¡æ~+55¡æ Hudimity:100%rh~80%rh" Safety classification :category b inside power Dimension: approx 72(w)*70(h)*32(d)mm Weight: approx.130g, excluding batteries Pressure measurement :semiconductor pressure sensor Pulse measurement :semiconductor pressure sensor Wrist circumference :(13.5~19.5)cm Box dimensions:100*100*80 mm Carton dimensions:440*440*210 mm Quantity/carton:40 pcs Volume /carton:0.03696cbm Weight /carton:8--9kg 20 container quantity:about28800pcs