Nikon D500 User Manual page 355

The SU-800 Wireless Speedlight Commander: When mounted on a CLS-
compatible camera, the SU-800 can be used as a commander for
SB-5000, SB-910, SB-900, SB-800, SB-700, SB-600, SB-500, or
SB-R200 flash units in up to three groups. The SU-800 itself is not
equipped with a flash.
A
Modeling Illumination
CLS-compatible flash units emit a modeling flash when the camera Pv
button is pressed. This feature can be used with Advanced Wireless
Lighting to preview the total lighting effect achieved with multiple
flash units. Modeling illumination can be turned off using Custom
Setting e5 (Modeling flash, 0 300).
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