Metz mecablitz M400 Mode D'emploi page 171

Reflector card (recessed)
Wide angle diffuser disk (recessed)
LED video light
AF auxiliary light
Battery compartment (4x AA – see safety information)
USB socket (micro)
ON / OFF button
lights up green when reaching the flash readiness
lights red in standby
Cursor keys:
Selection of menu items and value adjustment
k
Flash modes
Options menu
Confirmation/info key
OLED display
Knurled nut
Integrated sensors for the remote mode