Specifications and features
The specifications were formalized by the Bluetooth Special Interest Group (SIG). The SIG was formally announced on 20 May 1998. Today it has a membership of over 30,000 companies worldwide.[40] It was established by Ericsson, IBM, Intel, Toshiba and Nokia, and later joined by many other companies.
All versions of the Bluetooth standards support downward compatibility.[clarification needed] That lets the latest standard cover all older versions.
The Bluetooth Core Specification Working Group (CSWG) produces mainly 4 kinds of specifications
The Bluetooth Core Specification, release cycle is typically a few years in between
Core Specification Addendum (CSA), release cycle can be as tight as a few times per year
Core Specification Supplements (CSS), can be released very quickly
Errata