Focusrite Scarlett 18i20 USB-C Audio/MIDI Interface (3rd Generation) - Manual (Page 34)

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Front Panel indicators
USB/Power Green LED
Phantom power 2 x red LEDs (Chs 1-4, 5-8)
Instrument mode 2 x red LEDs (Chs 1 & 2)
AIR mode 8 x yellow LEDs
Pad active 8 x green LEDs
MIDI data received Green LED
Lock indicator Green LED
Talkback active Green LED
ALT speakers selected Green LED
Monitors DIM and MUTE Yellow LED (DIM); red LED (MUTE)
Weight and Dimensions
W x D x H
482.6 mm x 46.6 mm (1U) x 259.8 mm
19 in x 1.83 in (1U) x 10.23 in
Weight
3.195 kg
7.16 lb