Nikon D7200 body - Manual (Page 184)

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When the camera is used with optional WR-1 and WR-R10/
WR-T10 (
0 319) wireless remote controllers, the shutter-release
buttons on the WR-1 and WR-T10 perform the same functions as
the camera shutter-release button, allowing remote continuous
and self-timer photography.
WR-1 Wireless Remote Controllers
The WR-1 can function as either a transmitter or a receiver and is
used in combination either with another WR-1 or a WR-R10 or
WR-T10 wireless remote controller. For example, a WR-1 can be
connected to the accessory terminal for use as a receiver,
allowing camera settings to be changed or the shutter to be
released remotely by another WR-1 acting as a transmitter.
WR-R10/WR-T10 Wireless Remote Controllers
When a WR-R10 (transceiver) is connected to the camera, the
shutter can be released using a WR-T10 (transmitter).
Wireless Remote Controllers