Input 1 (Mono); Input 2; Foot Switch Release Pins - DigiTech HARDWIRE SP-7 Owner's Manual

6. Input 1 (Mono) - When only a single input is needed, this jack must
be used. Signals will still be heard at both outputs when only the Input
1 (Mono) jack is connected to. Connecting a guitar cable to the In
1(Mono) jack supplies battery power even though the Indicator LED
may not be lit. To prolong battery life, disconnect all cables from the
pedal when not in use. If the optional power supply is used for power,
the input can remain connected.
7. Input 2 - Connect a second input to this jack for stereo operation.
Inputs 1 and 2 are fed through the effect then to Outputs 1 and 2 and
will keep true stereo separation between channels.
8. Foot Switch Release Pins - These two pins are spring-loaded
hinges that hold the pedal in place. Push these pins in with the tip of a
1/4" guitar cable to release the pedal from the pedal chassis exposing
the battery compartment (See battery replacement diagram).
6