Automatic inflation, automatic measurement HIGH ACCURACY with Oscillometric measuring technology – Precise pressure measuring device for accurate and stable readings. Measures deviation of 40 mmHg. Even a slight pressure change can be detected. EASY TO USE: with convenient ON/OFF function. Operation strap on your upper arm to measure blood pressure and pulse. SUPERB ACCURACY: Most Advanced Fuzzy Algorithm avoids over-pumping and ensures high accuracy accessories: Arm Cuff and air tube ,user manual ,certificate card,4 section dry batteries and pulse oximeter