Sony UWP-D27 2-Person Camera-Mount Wireless Omni Lavalier Microphone System (UC90: 941 to 960 MHz) - Manual (Page 75)

Help Guide
Interchangeable Lens Digital Camera
ILCE-7C α7C
Multi Battery Adaptor Kit
You can use the Multi Battery Adaptor Kit (sold separately) with this camera to shoot for long periods.
For details, refer also to the operating instructions supplied with the Multi Battery Adaptor Kit.
Note
While the plug-in plate of the Multi Battery Adaptor Kit is inserted in the camera, do not slide the battery lock lever of the camera.
The plug-in plate will be ejected from the camera if you do so.
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