Nikon WT-4A D4 D3X D3 D800 D700 D300S D300 - Manual (Page 184)

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Menu Guide
Device Info
This menu displays the following information about the WT-4.
This option is only available when the WT-4 is connected to the
camera via USB and the WT-4 is on.
Battery Info
Displays information on the battery inserted
in the WT-4. The [Charging life] display
shows battery age; replace [Charging life]
reaches [4].
MAC Address
Shows the MAC address of the WT-4.
Firmware Version
Displays the WT-4 firmware version.