You can use the external power supply-DC 5V by adapter if the batteries are not available.
Roll up the cuff to cover your arm and keep it at the same level as your heart. Keep the cuff 2-3cm above your elbow
Stretch your arm forward on the desk and keep relaxing, make sure your palm is upturned Sit still and avoid body movement during the measurement.
After pressing the STARTISTOP button, the device will automatically start to broadcast preset the cull pressure and do the Measurement.
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Display: Big LCD Digital Display
Pressure measurement range: 20~280mmHg
Pressure accuracy: ±3mmHg(±0.4kPa)
Pulse measurement range: 40 ~199 beats /min
Power System: USB power adapter (4*AAA alkaline batteries not included)
Certificate: CE ROHS FDA SGS REACH SFDA IS