Focusrite Scarlett 18i8 USB-C Audio/MIDI Interface (3rd Generation) - Manual (Page 28)

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Front Panel indicators
USB power Green LED
Gain Halos Tri-colour LED rings (concentric with GAIN controls)
Phantom power 2 x red LEDs
Instrument mode 2 x red LEDs
AIR mode 4 x yellow LEDs
Pad active 4 x green LEDs
MIDI data received Green LED
ALT speaker mode Green LED
Weight and Dimensions
W x H x D
241 mm x 61 mm x 159.5 mm
9.49 in x 2.40 in x 6.28 in
Weight
1.335 kg
2.94 lb