When the weather's poor, making that trek out to the mailbox can be an undesirable chore. And since delivery schedules can be unpredictable, all too often you may find yourself peeking through that mail slot several times a day. But with the Mail Chime, you'll always know instantly when the mail has been delivered. The Mail Chime will ring as soon as the mail arrives, even if your home is 450 feet away from your mailbox! Simply mount the sensor on your mailbox door using the included double-face tape and plug the receiver into an electrical outlet anywhere in your home. When the mailbox door is opened, the battery-powered sensor (battery included) sends a wireless signal to the Mail Chime, which will announce the mail's delivery with a red LED light and four beeps. Just press the reset button after retrieving your mail to set the Mail Chime up for the next day's delivery.