Wis. Stat. § 5.76

The governing body or board of election commissioners of any municipality may by ordinance or resolution adopt, experiment with, or discontinue any electronic voting system authorized by this subchapter and approved under s. 5.91 for use in this state, and may purchase or lease materials or equipment for such system to be used in all or some of the wards within its jurisdiction, either exclusively in combination with mechanical voting machines, or in combination with paper ballots where such ballots are authorized to be used.