Funnytool Mini Piggy Bank Safe Box Money Coin ATM Bank Toy ATM Machine Kids Gift Money Box Digital Saving Boxes Before use, put 3 "AA" size batteries. To open the safe, you have to enter a 4-digit password. The preset password for the safe is "0000". You can also change the password. If you forgot the password it can be reset by removing and reinstalling the batteries. It will alert you if you put wrong password. You can store the coins and notes in it.