Sony Glasstron Lite PLM-A35E Operating Instructions Manual page 31

Instructions for Safe Fit
Warning: Proper Fit.
Each time you use this product, adjustment screens will appear requiring the
viewer to properly fit the product. Failure to properly fit the product each time
may result in eye fatigue, eye damage, or loss of visual functions and may result
in accident or injury. For instructions on how to properly fit this product, see
pages 12 through 14 on the Operating Instructions.
Warning: No Use by Children Age 15 or Younger.
This product is designed for adult use.
The eyes of children are still developing and may be adversely affected by use of
this product, and it may cause eye fatigue, eye damage, or loss of visual
functions.
In addition, this product may not be adjusted to fit a child's head.
User lock: To prevent use by children age 15 or younger, this product is
equipped with a locking system. For instructions on the use of the
user lock system, see page 19 on the Operating Instructions.