ISO/IEEE 11073-10427:2018 establishes a normative de? nition of communication between devices containing a power source (agents) and managers (e.g., cell phones, personal computers, personal health appliances, set-top boxes) in a manner that enables plug-and-play interoperability. Using existing terminology, information pro? les, applica-tion pro? le standards, and transport standards as de? ned in other ISO/IEEE 11073 standards, this standard de-? nes a common core of communication functionality of personal health devices (PHDs) containing a battery, including: 1) current device power status (e.g., on mains or on battery); 2) power charge status (e.g., percent of full charge); and 3) estimated time remaining (e.g., minutes).