Specification:Material: Plastic shellColor: WhiteDisplay mode: LCD Digtal DisplayMeasurement method: Oscillographic measurement methodMeasurement range: Pressure: 0~280mmHg(0kPa~37.3kPa) pulse: 40~199 beats/minAccuracy: Pressure: within±3mm Hg pulse: within±5%Power supply: DC 5V(4 AAA Batteries)Operating environment: 5~40℃,15%RH~80%RHStorage temperature: -20~55℃,10%RH~93%RHMeasuring range: about 220mm-320mmSecurity classification: internal power supply type BPressure mode: Automatic pressure modeExhaust way: Automatic rapid exhaustPressure testing: Semiconductor pressure sensorPules testing: Semiconductor pressure sensorSize: (L)X(W)X(H) 116X98X60mm /4.57''X3.86''X2.36"(appr.) Features- Heartbeat prompting voice- Inncorrect prompting function- A Large screen display and digtal legible- Measurement completed prompting voice- Clock function:year, month, day, hour, minute setting- Low power detection: detecting low power under any working state- The device has Kpa and mmHg display switching and measurement functions- Automatic shutdown function: no operation for 1 minute the the device will shut down automatically- Overpressure protection function:when the pressure is more than 300mmHg, the device will exhaust fast automaticaolly- Double memory lookup function and can store 99 set of measurements for each person to remenber the normal status of your blood pressure- It has the average of the last three display function|(press the memory key for the first time to display the valve that ist the aveerage of the last three measurement) Package included:1 Pcs Blood Pressure Monitor (battery not included)1 Pcs Armband1 Pcs English User