Lenovo 250610U - Thinkpad X4 Ultrabase User Manual page 10

DANGER
Do not open the optical storage drive unit; no user adjustments or
serviceable parts are inside.
Use of controls, adjustments, or the performance of procedures other than
those specified might result in hazardous radiation exposure.
Class 1 laser products are not considered hazardous. The design of the laser
system and the optical storage drive ensures that there is no exposure to laser
radiation above a Class 1 level during normal operation, user maintenance, or
servicing.
Some drives contain an embedded Class 3A laser diode. Note this warning:
DANGER
Emits visible and invisible laser radiation when open. Avoid direct eye
exposure. Do not stare into the beam or view it directly with optical
instruments.
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