Consumer Electronics Control (CEC) is a feature of HDMI designed to control HDMI connected devices[1][2] by using only one remote controller; so, individual CEC enabled devices can command and control each other without user intervention, for up to 15 devices.[3]: §CEC-3.1 For example, a TV remote can also control a digital video recorder and a Blu-ray player.
It is a single-wire bidirectional serial bus that is based on the CENELEC standard AV.link protocol to perform remote control functions.[4] CEC wiring is mandatory, although implementation of CEC in a product is optional.[3]: §8.1 It was defined in HDMI Specification 1.0 and updated in HDMI 1.2, HDMI 1.2a and HDMI 1.3a (which added timer and audio commands to the bus).[3]: §§CEC-1.2,CEC-1.3,CEC-3.1,CEC-5 USB-to-CEC adapters exist that allow a computer to control CEC-enabled devices.[5]