How to use:Keep relaxed before measuring, sit down quietly for a momentPalms up, put the wrist band, parallel to the heartPalms up, keep the intake pipe and the arteries parallelledWrap the wristband around your arm tightly in the opposite direction, paste togetherPlace one finger into it is the most appropriateKeep the wristband parallelled to the heart, palms upPress the on / off button, keep relaxed and start measuringHigh pressure, low pressure, pulse instantly displayed after 40 seconds Measurement range:Pressure range: 0 - 37.3kpa ( 0 - 280mmhg )Pulse range: 40 - 199 times / minWrist band display range: 0 - 39.9kpa ( 0-299mmhg )Static pressure: ±0.4kpa ( ±3mmhg )Pulse: Within ±5 percentageResolution: 0.1kpaPower supply: DC6V ( 1.5V four AAA batteries, not include the battery )Temperature and moisture: Temperature: - 10 - 55 degree centigrade moisture: 10 percentage - 85 percentage RHUsing temperature moisture: Temperature: 5 - 40 degree centigrade moisture: 15 percentage - 85 percentage RH Item Type: Blood Pressure For (Blood pressure): Arm Materials: Plastic Package weight: 0.552 kg Product Size ( L x W x H ): 11.50 x 9.50 x 5.50 cm / 4.53 x 3.74 x 2.17 inches Package Size ( L x W x H ): 16.00 x 10.00 x 11.00 cm / 6.3 x 3.94 x 4.33 inches Package Content: 1 x Blood Pressure Monitor, 1 x USB Charger, 1 x Connecting Cable, 1 x Wrist Band, 1 x English Manual