S.D. Codified Laws § 47-23-21
Meetings of the board of directors, regular or special, may be held either within or without this state, and upon such notice as the bylaws may prescribe. Attendance of a director at any meeting shall constitute a waiver of notice of such meeting except where a director attends a meeting for the express purpose of objecting to the transaction of any business because the meeting is not lawfully called or convened. Neither the business to be transacted at, nor the purpose of, any regular or special meeting of the board of directors need be specified in the notice or waiver of notice of such meeting.
Unless restricted by the articles of incorporation or bylaws, members of the board of directors or any committee designated by the board of directors may participate in a meeting of such board or committee by means of teleconference or similar communications equipment which allows all persons participating in the meeting to hear each other at the same time. Participation by a board or committee member in a teleconference constitutes presence in person at a meeting.
SDCL 47-23-21