The Omron Gold Wireless wrist blood pressure monitor stores up to 200 readings for 2 users (100 readings for each user) in the monitor, or unlimited readings when used with the Omron Connect app, allowing you to keep a comprehensive recording of your readings over time and monitor any fluctuations in your readings. The app also lets you view your trend graphs and charts, and share as needed with your family, caregivers, or doctors. The Omron Connect app works with select iOS and Android devices, as well as Alexa using the Omron Health Skill. OMRON Gold Blood Pressure Monitor, Portable Wireless Wrist Monitor, Digital Bluetooth Blood Pressure Machine, Stores Up To 200 Readings for Two Users (100 readings each)