JOYO Wah-I and Wah-II official video 

These two pedals are multifunctional WAH-WAH pedals, featuring both WAH and VOLUME functions.
In Wah/Vol mode, minimum volume control knob is one of its characteristics, by adjusting the MIN VOL knob you can obtain volume while toeing down the pedal completely. For example, you can turn down the volume a lot according to the needs of your performance, or just attenuate half of the volume.
In Wah/Bypass mode, they both provide excellent filter effect, reminding you of all the classical solos and riffs with wah. What's more, Wah-II Multimode Wah allows you to customize your tone with a Q value knob and Range knob. The Q value knob, ensures that the sound changes from compact, sharp to mellow, wide style. And the range knob provides 6 frequency ranges, so you can choose different center frequencies to get diverse tones catering to various music styles.
The feel of these Wah pedals are amazing and the range of motion is ergonomic, besides, skidproof rubber cushion for the feet enhances durability. The bright LEDs are on both sides, which means you can check the pedal’s working status anywhere you set it.
Features:
•Featuring both WAH and VOLUME functions.
•Q value knob and Range knob are available on Wah-II Multimode Wah.
•Controllers: Wah/Vol or Wah/Bypass select toggle, MIN VOL knob, Q value knob(Wah-II), Range knob(Wah-II).
•Working status LEDs on both sides.