KaS Product was a French electronic duo. Their music has been considered part of the French cold wave and electropunk movements. Formed in 1980, the duo consists of Spatsz on electronics and rhythm machines with Mona Soyoc on guitar, vocals and piano. Spatsz worked at a psychiatric hospital previously while Soyoc worked with a jazz band before meeting Spatsz.Their music is done in a similar minimal electronics and vocal style akin to Kaleidoscope-era Siouxsie and the Banshees, Suicide and Soft Cell. The press compared Soyoc's voice to that of Siouxsie Sioux.