Operation is simple. The colour of the LED represents four different modes:

Dim Blue - KnockLink is powered, waiting for the engine to be started

Flashing Blue - KnockLink has detected the engine has started and is now calibrating

Dim Green - KnockLink is adapting to the engine's noise profile and listening for knock

Flashing Red - KnockLink has detected knock. Avoid large throttle openings, seek professional advice