Trister Automatic Upper Arm Blood Pressure Monitor TS-350BP Features: Irregular Heartbeat Indicator WHO BP Classification Indicator Clinician Tested & Approved Memory store: 3 persons x 120 results each Date/Time displayed LCD Display Automatic Off Measurement method: Oscillometric testing Power source: 4*AAA/LR03 (1.5V), Alkaline batteries, D6 V 5-year warranty ISO, CE and FDA510K certified