MSI CX420 User Manual page 45

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3. Battery Release Button
It is a bounce-back device as a preparation for releasing the battery pack. Slide it with one hand
and pull the battery pack carefully with the other.
4. Ventilator
The ventilator is designed to cool the system. DO NOT block the ventilator for air circulation.
5. Stereo Speaker
Give high quality sound blaster with stereo system and Hi-Fi function supported.