Storage temperature: -20 ~50 Storage humidity: 15%~90% Operating temperature: 10 ~40 Operating humidity: 40%~85% Display: LCD digital display screen Measurement method: pulse scanning/oscillometry Measurement range: hypertension/Hypotension: 20mmHg~280mmHg Pulse: (40-200) times/minute Accuracy: 3mm Hg ( 0.4 kPa) Pulse: within 3% of reading value Voltage: 3V Voice Broadcast: The blood pressure monitor will tell you the result after the measurement. Suitable for the elderly and people with poor eyesight. The voice function can be turned off if it is not needed. Dual User Mode: This bp monitor supports data storage for 2 users, each user can store 99 groups of data memory with date and time stamp. Track your health and compare trends over time. Irregular Heartbeat Detector: The updated Irregular Heartbeat Detector detects and reminds you of irregular heartbeats during the measurement process, and issues a warning signal on the screen in time. Super Simple: Just put on the cuff, press the switch button, and you will get the answer within 30 seconds. Super easy and family friendly. Tips: Keep the monitor at the same height as your heart when measuring, relax and dont move. Do not drink alcohol or coffee, eat, drink, smoke, exercise, and bathe for 30 minutes before the measurement.