Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 22)

Safety Precautions
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Cautions:
Follow the cautions below. Otherwise, physical injury
or property damage may result.
Do not use or store the product in a high-temperature location such as inside a car
under the hot sun. The product may become hot and cause burns. Doing so may
also cause battery leakage or explosion, which will degrade the performance or
shorten the life of the product.
Do not carry the camera around when it is attached to a tripod. Doing so may cause
an injury or an accident. Also make sure the tripod is sturdy enough to support the
camera and lens.
Do not leave the product in a low-temperature environment for an extended period of
time. The product will become cold and may cause injury when touched.
Do not fire the flash near the eyes. It may hurt the eyes.
Never play the provided CD-ROM in a drive that is not compatible with the CD-ROM.
If you use it in a music CD player, you may damage the speakers and other
components. When using headphones, there is also a risk of injury to your ears from
excessively loud volume.
While listening with headphones, do not change the sound-recording settings. Doing
so may cause a blast of loud sound that will hurt your ears.