Kyocera ENERGI K490 - Manual (Page 10)

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The standard incorporates a substantial margin of safety to give
additional protection for the public and to account for any variations in
measurements.
Caution
The user is cautioned that changes or modifications not expressly
approved by the party responsible for compliance could void the warranty
and user’s authority to operate the equipment.
Warning
Use only Kyocera approved accessories with Kyocera phones. Use of
any unauthorized accessories (includes faceplates/front housings) may
be dangerous and will invalidate the phone warranty if said accessories
cause damage or a defect to the phone.
Optimize your phone’s performance
Use the guidelines on page 2 to learn how to optimize the performance
and life of your phone and battery.