The Rocktron Classic Wah has a heavy duty, all metal chassis with tension adjustment for the pedal.The Rocktron Classic Wah includes Rocktron’s easy access battery compartment which makes changing batteries during a gig a breeze. The Rocktron Classic Wah can be powered by batteries or AC powered. The Rocktron Classic Wah, as with all Wah Wah pedals, should normally be put in the beginning of your signal chain. Although you may place your wah at any place in your signal chain, it usually sounds best at the beginning – directly from your guitar. Adjustable pedal rocker tension lets you adjust the pedal action for a lighter or heavier “touch”.