Cal. Civ. Code § 1812.3

The notice provided for in Section 1812.2 shall be given to the buyer and any other person liable by causing it to be delivered personally or to be deposited in the United States mail addressed to the buyer or to such other person at his last known address and shall advise the buyer or such other person of his right to redeem as provided for in Section 1812.2. If the holder determines to sell the goods at public sale he shall give notice of the time and place of sale at least 10 days before the date of sale by delivering a copy of the notice personally to the buyer or other person liable or depositing the same in the United States mail addressed to the buyer or such other person at his last known address.