DigiTech makes a variety of musical equipments and accessories, including a wide range of effects pedals covering everything from traditional effects like distortion and reverb to some more experimental ones like flange and phasers. Most of these effects are battery powered, so eventually the batteries must be replaced.
Locate the release pins on either side of the pedal hinge and push one with the tip of the 1/4-inch patch cable. Remove the pedal itself from the rest of the box.
Remove and disconnect the battery from its compartment under the pedal and replace it with the new battery.
Replace the pedal by lining the hinge holes up with one of the release pins. Hold down the other release pin and lower the rest of the pedal over the housing. Both pins will be even with the pedal top when it is in the correct position.
Be careful that you don't trap the battery wire between the pedal and the housing when you are replacing the pedal top.