The 3 Series Wrist provides these 3 benefits: Simple and portable design: Discrete and convenient portable wrist unit allows users to monitor their blood pressure at home, work or anywhere. Advanced averaging: Exclusive technology automatically displays the average of up to the last 3 readings taken within the last 10 minutes. 60 memory storage with date and time stamp allows you to review the last 60 readings with the touch of a button. Contains: 1 digital wrist automatic blood pressure monitor with attached wrist cuff (fits wrists 5-1/4 to 8-1/2 inches in circumference), 1 illustrated English/Spanish instruction manual, 1 Quick Start guide, 2 AAA batteries, 1 storage case. 2 year limited warranty.