BP apparatus specifications include: type, which can be digital (oscillometric), mercurial, or aneroid; cuff size, with standard adult upper arm circumferences being 22-42cm; measuring range, typically 0-299mmHg or 0-300mmHg, with an accuracy of ±3mmHg; power source, often AAA batteries or USB for digital devices; and memory function, a common feature in digital models for storing readings. Other specs include automatic inflation/deflation, body movement detection, and irregular heartbeat detection for digital models