---
title: HDMI-CEC
description: HDMI-CEC lets devices connected over HDMI control each other, such as a media player switching a TV on or off.
type: glossary
term: HDMI-CEC
category: devices
shortDefinition: HDMI-CEC (Consumer Electronics Control) lets devices connected by HDMI send each other simple commands, such as power on, standby or input switching. Signage setups use it to let a media player control the screen it is plugged into.
seeAlso:
  - Media player
  - Duty cycle
visual: power
---

CEC is the reason one remote can often control both a TV and a set-top box.

## Why it matters

- **Power scheduling without a smart display.** A media player can switch a connected screen off overnight when CEC works.
- **Inconsistent support.** Brands name and implement CEC differently, and some commands don't work across every pairing.
- **Test before rollout.** Confirm the exact display and player combination on a pilot screen.

Commercial displays often offer more reliable control over RS-232 or their own signage platform instead.