Joyo JF-10 Dynamic Compressor Guitar Effect Pedal True Bypass

Features:
A re-creation of the classic Ross compressor, with very low noise.
Use the Sustain, Attack, and Level knobs to find your ideal tone.
Sustain: To control the delaying time of compressing;
Attack: To control the starting time of compressing effect;
Level: To control the output level.
The Attack is especially designed for Bass or high-output active pickup.
True bypass design minimizes tone loss.
Aluminum alloy casing with stove varnish finish.
Powered by a 6FF22 9V battery or 9V DC power adapter (neither included).