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