State-of-the-art measurement technology to monitoring blood pressure at the wrist with the push of a single button.This wrist monitor is smaller, lighter and more compact than other wrist monitors and is ideal for travel. The automatic memory keeps your last 90 blood pressure measurements for effective tracking. The UB-521 also has the Irregular Heartbeat feature. This feature provides blood pressure and pulse rate measurements even when an Irregular Heartbeat occurs and alerts the user. Simultaneous readout of systolic/diastolic pressure and pulse rate. Large-print instruction guide with illustrations and quick start card in English, French and Spanish. Fits wrists up to 8.5". Operates on 2 AAA batteries (included).