Features: 1.Lcd size:36*44mm 2.Intelligent automatic measument 3.Who blood pressure classification 4.Large and clear lcd displya Specification: Display styledigital lcd display Measurement styleoscillography Measurement range"pressure:(30~280)mmhg Pulse:(40~199)beat/min" Accuracy:"static pressure:+3mmhg Pulse rate:within +5%" Memory:90 memories Power sourcedc3v(2 batteries of aaa type) Operating environment:"temperat Hudimity:¡¨¹80%rh" "storage&transportation Environment""temperature:-20¡æ~+55¡æ Hudimity:100%rh~80%rh" Safety classificationcategory b inside power Dimension:approx 72(w)*70(h)*32(d)mm Weight:approx.130g, excluding batteries Pressure measurementsemiconductor pressure sensor Pulse measurementsemiconductor pressure sensor Wrist circumference(13.5~19.5)cm