Warm Audio Ringerbringer ring modulator in like-new condition. Used once in my home studio and then shelved. Functions perfectly. Ideal if you don't feel like paying thousands for a Moog.

From the website:

1. REVIVING AN AVANT-GARDE PEDAL FOR MUSIC’S TRAILBLAZERS From light Lo-Fi modulation all the way to the piercing sound of infinity ring-modulation, the Warm Audio RingerBringer accurately recreates the ultimate all-analog ring modulation effect used for experimental tones. Like the original, loved by artists like Jeff Beck, Radiohead, Omar Rodríguez-López, Trent Reznor, and many more, RingerBringer delivers the original distinct set of controls, extensive in/out options, and rich sonic textures to inspire boundless sonic experimentation.
3. DON’T JUST PLAY, CREATE The ideal platform for the sonic tinkerer, RingerBringer inspires you to generate layered frequencies and harmonics, explore a wide range of sonic possibilities for guitar, bass, synthesizers & beyond, and design your own sounds from the ground up. Extensive controls including LFO, MOD, FREQ (FREQUENCY) & RATE open up sonic possibilities that range from subtle overdriven textures all the way to wobbling, warped leads soaked in texture and tone. RingerBringer is 100% analog and sports premium components including hand-selected op-amps and transistors. RingerBringer is no emulation or “patch”, instead it delivers true-to-spec performance of the boutique, analog original.