The CozyLife smart thermometer and hygrometer uses Wi-Fi Direct to sync environmental data to your smartphone in real time. Equipped with a high-definition e-ink screen, it clearly displays the current temperature, humidity, and comfort level, and supports customizable doodles or text messages, transforming it into a smart interactive message board for your home. No gateway is needed; connection is simple. You can view historical data curves and set alarms for abnormal conditions via a dedicated app. It's both a precise environmental monitoring assistant and a personalized decorative element, allowing you to care for your family and home environment anytime, anywhere.Product Features:**Smart Wi-Fi Direct Connection:** Connects directly to your home Wi-Fi network without an additional gateway or Bluetooth relay, enabling remote real-time data viewing. Even when you're away, you can monitor the temperature and humidity at home.**High-Definition E-Ink Screen:** Utilizes a low-power e-ink screen, providing clear and soft display with no blue light pollution. Power is only consumed during data updates, ensuring long battery life.**Creative Doodle Message Board:** Use the mobile app to freely draw doodles, post text or emoticons on the device screen, creating a fun and interactive window for family members to exchange warm reminders, greetings, or creative messages.Precise Sensing and Alarms: Built-in high-precision sensors ensure accurate data. Upper and lower limits for temperature and humidity alarms can be set; when the environment is abnormal (e.g., excessively dry or humid), your phone will receive a push notification.Historical Data and Trends: The app automatically records and generates temperature and humidity change curves to help you analyze indoor environmental patterns, facilitating adjustments to air conditioners, humidifiers, and other devices.Please note that different options correspond to different apps; please select the app option that best suits your needs.