Nero 5G Ozone Machine Owner's Manual page 3

CAUTION: TO REDUCE THE RISK OF ELECTRICAL SHOCK, DO
NOT REMOVE COVER. NO USER SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVCE PERSONNEL.
This "bolt of lightning" indicates that uninsulated material
within your unit may cause an electrical shock. For the safety
of everyone, do not remove product covering.
CAUTION
RISK OF ELECTRICAL
SHOCK DO NOT
OPEN
ATTENTION
3