Withings BPM Core Instruction Manual page 32

Caution
EN
General usage
Always consult your doctor. Self-diagnosis of
measurement results and self treatment are dangerous.
People with severe blood flow problems or blood
disorders should consult a doctor before using the
blood pressure monitor. Cuff inflation can cause
internal bleeding. Operational factors such as common
arrhythmias, ventricular premature beats, arterial sclerosis,
poor perfusion, diabetes, age, pregnancy, pre-eclampsia
or renal disease can affect the performance of the
automated sphygmomanometer and/or its blood pressure
reading. This is a precision measuring device that may
be understood by lay users, but should still be handled
with care. Exposing the device to prolonged lint, dust or
sunlight might reduce its life or damage it. A damaged
cuff or sensor may lead to incorrect measurements. The
USB port should only be used for charging the device. The
user is an intended operator. Parts in contact with the skin:
cuff and electrodes. Measurements can be affected by
extreme temperatures, humidity & altitude.