HP Wired H120 Stereo Gaming Headset with mic 80pcs 60x60cm Indoor Toilet Training Puppy Pet Dog Pads don't talking or moving when don't talking or moving when measuring Sit in a comfortable position and rest your arm on a table at approximately heart level for the reading Note that your blood pressure can vary significantly in as little as a few minutes For maximum accuracy you can use the option to average your last 3 readings Specifications Measuring range :Blood Pressure : 30~280 mmHg Pulse Rate : 40~199 beats min Calibration Accuracy : Blood Pressure : ± 3 mmHg Pulse rate : ± 4% of reading Operating environment : 50 °F ~104 °F with relative humidity up to 85% (non condensing) Storage Transportation environment : with relative humidity up to 85% (non condensing) Power Source :2 x 1 2 your memory foam desk chair Voltage: DC5V 5mm jack + USB