It's a wah, but more, so... a waaaaah, right? Stanley Clarke is a jazz/fusion bass legend with a huge resume. This has standard wah stuff, but also high pass and low pass modes, bandwidth control, bypass switch and can be used as a volume pedal. Great on guitar or bass, or maybe even... keys? 

Model: EBS Stanley Clarke Signature Wah Pedal
Made: China, recent model
Type: wah/filter
Power: standard 9v supply or battery
Switching: true bypass
Equivalent new street price (approx): $529aud
Mods: velcro added, battery box taped shut
Accessories: no box or manual
Condition notes: used, no major marks, fully functional. Overall: very good condition