This is a vintage Keio Synthesizer Traveler “Singing Geisha” wah/fuzz/synth effects pedal. This particular example, serial number 720147, is in very excellent all original condition. It works perfectly, sounds incredibly interesting, and with some familiarity, it becomes a very expressive and completely unique voice. With 4 separate volume/blend knobs related to different features of the pedal along with a traditional wah-style foot-operated pitch control, and 2 stomp switches, the pedal is actually incredibly versatile. The singing tone is not reminiscent of the “siren” feature of concurrent Shin-Ei units, and as mentioned, the pitch of which can actually be controlled, producing a pleasant theremin-esque synth sound.