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. EASIER TO READ: Extra-large LCD screen shows stable and clear numbers, making it easy to read and bright enough to see in the dark. LIGHT WEIGHT Super lightweight and non-fragile features make this a portable fitness partner. Detects body movement hence gives more accurate reading