Verykool s758 - Manual (Page 50)

NOTE 2: Any changes or modifications
not expressly approved by the
manufacturer could void the user’s
authority to operate the equipment.
NOTE 3: The manufacturer is not
responsible for any radio or TV
interference caused by unauthorized
modifications to this equipment. Such
modifications could void the user’s
authority to operate the equipment.
FCC Hearing-Aid Compatibility
(HAC) Regulations for Wireless
Devices
50