Wis. Stat. § 704.10: Electronic delivery.

A rental agreement may include a provision that permits the landlord to provide and indicate agreement by electronic means any of the following:

(1) A copy of the rental agreement and any document related to the rental agreement.

(2) A security deposit and any documents related to the accounting and disposition of the security deposit and security deposit refund.

(3) A promise made before the initial rental agreement to clean, repair, or otherwise improve any portion of the premises.

(4) Advance notice of entry under s. 704.05 (2).