Indiana Code Title 34. Civil Law and Procedure § 34-50-1-4

(1) be in writing;

(2) be signed by the offeror or the offeror's attorney of record;

(3) be designated on its face as a qualified settlement offer;

(4) be delivered to each recipient or recipient's attorney of record:

(5) set forth the complete terms of the settlement proposed by the offeror to the recipient in sufficient detail to allow the recipient to decide whether to accept or reject it;

(6) include the name and address of the offeror and the offeror's attorney of record, if any;  and

(7) expressly revoke all prior qualified settlement offers made by the offeror to the recipient.