U81RH is an automatic digital upper-arm blood pressure monitor that uses an inflatable cuff to provide systolic, diastolic, and heart rate readings on a large LCD screen. Key features include one-button operation for automatic measurement, memory storage for tracking readings over time, and a cuff that fits a range of arm sizes, typically from 8.7 to 16.5 inches (22-42 cm) in circumference. The device is battery-powered, lightweight, and designed for ease of use at home, with features like an irregular heartbeat detection and color-coded display to simplify the reading of results.