The Blue Jay Elite Healthcare Products Perfect Measure Wrist Blood Pressure Monitor Is Lightweight Portable Convenient Accurate And Simple To Use Users Can Easily Check Their Blood Pressure With This Handy Wrist Blood Pressure Accurate Results Detected By Oscillograph One-touch Function Irregular Heartbeat Detection 90 Memory Recall With Date And Time Stamp Automatically Powers Off To Help Extend Battery Life Lcd Screen Display Who (world Health Organization) Bp Classification Indicator Average Of The 3 Most Recent Measurements Cuff Fits Wrists 6.1 - 9.8 In Circum. Runs On 2 'aaa' Batteries (not Included) 1 Year Warranty