Can be used for message phone, ensure that in case of power failure, important message information can be stored.

Can be used for message phone, ensure that in case of power failure, important message information can be stored.
Can be used for message phone, ensure that in case of power failure, important message information can be stored.
Can be used for message phone, ensure that in case of power failure, important message information can be stored.
Can be used for message phone, ensure that in case of power failure, important message information can be stored.
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