Boots Wrist Blood Pressure Monitor Clinically Validated Irregular Heartbeat brand new in original box The Boots Wrist Blood Pressure Monitor is worn on the wrist and uses the oscillometric method of blood pressure measurement. This means this monitor detects your blood movement through your brachial artery and converts the movements into a digital reading. 1 user x 30 memories Cuff size: 13.5-21.5cm Clinically validated Blood Pressure Indicator Irregular Heartbeat Detection