Indicator Led - DigiTech Bad Monkey Manual

8. Pedal
Press the pedal to turn the effect on and off.
9. Out 1(Amp) Jack
Connect this output to your guitar amplifier.

10. Indicator LED

This LED indicates when the effect is turned on. If the LED becomes
dim or does not light when the cables are connected, the battery needs
to be replaced.
11. Out 2 (Mixer) Jack
This output features DigiTech's speaker cabinet emulation, that lets you
run the pedal directly into a mixer or recorder input without having to
use a guitar amplifier.