Check the listing for details. Mail Alert - Mail Flag - Mailbox - FOR FLAT TOP STYLE BOX ONLY AS SHOWN - NEW. Color: Black, Condition: New. Listed at 13.95 USD. (MAILBOX NOT INCLUDED) Only for FLAT TOP STYLE box as shown - New and Improved with a 3D Printed UV Resistant Ball! Mailbox Maide is a mechanical indicator that attaches to the top of your flat top style mailbox that visually alerts you when you have received mail. No batteries or electronics needed. This unit is made in Troy, Ohio USA. It is made to fit FLAT TOP STYLE mail box shown, when your mailbox door is opened, it pushes the ball and spring out of its latch and sticks up higher than the box. To reset, place the spring back in the latch with the ball facing down in front of the door. It is attached to your mail box using 3M Body side molding adhesive, however the mailbox temperature must be 40f or more for installation. Included is the Mailbox Maide, sand paper, an alcohol wipe, and instructions.NOTE: THIS IS ONLY DESIGNED FOR A FLAT TOP STYLE BOX AS SHOWNMAILBOX IS NOT INCLUDEDSearch Mail Alert 2 for Spring/Ball replacementFREE SHIPPING TO THE LOWER 48 STATES ONLY