# During the meeting
# Content sharing
With TrueConf Videobar 015 and TrueConf Videobar 025, you can share content during a video call or a group conference. To this end, you need to connect a device that transmits content via HDMI, e.g., you can connect a laptop to the endpoint and show slides.
To start sharing content, you should do the following:
- Before or right during a conference, connect the device to the HDMI in port. 
- If necessary, enable content transmission via HDMI. 
- After that, your device’s content will be displayed in your video window (instead of your camera video). 
- You can switch between content sharing options using the Switch camera/content button on the remote control or the conference menu item  . .
# Mirroring your screen to the second monitor
If you need to mirror the screen to the second monitor, use the HDMI out 1 port. In this case, the image displayed on the main screen will be completely duplicated on the additional screen.
Please note that HDMI out 1 on TrueConf Videobar 010 and TrueConf Videobar 015 endpoints does not support the output of audio streams.
# Viewing chat messages
If you would like to exchange messages during a video meeting, press any of the Arrow keys on the remote control and press the button  . In this case, you can choose a group chat during a video conference or personal chat with a specific participant.
. In this case, you can choose a group chat during a video conference or personal chat with a specific participant.
# Adding users to the address book
You can add a user to your address book right during a conference. To that end, you need to:
- Open the list of participants in the conference menu. 
- Select a user and go to their profile. 
- Go to the User Information menu. 
- Press Add. 
# Managing your microphone and camera
To mute your microphone:
- During a conference, press the Turn off microphone button on the remote control or go to the conference menu and press the mute button  . .
- The button will be crossed out  . .
Similarly, you can turn on/off the video feed sent to the conference by pressing the disabled camera button on the remote control or the camera button  in the conference menu.
 in the conference menu.
# External webcams
During a conference, you may need to switch between various webcams. With TrueConf Videobar, you can connect additional cameras via available USB ports.
To switch between your cameras during a video call or a conference, use the conference menu item  .
.
# Additional settings
Use the  button to proceed to the additional menu. Here you can:
 button to proceed to the additional menu. Here you can:
- Switch between cameras, microphones and speakers if you have multiple devices connected. 
- Enable automatic anti-flickering filter. 
- Change the camera angle for compatible webcams. 
- Adjust volume level. 
- Configure echo cancellation (auto, on or off).