This wireless solution couldn’t be any easier to install or use, and makes life more convenient. Simply mount the battery powered sensor on your mailbox door using double sided tape (included), and then plug the receiver into an electrical outlet anywhere in your home. When your mail is delivered, you’ll receive and audible and visual notification; the sensor transmits a wireless signal to the receiver, which will beep four times and a bright red LED will illuminate. This solution has a 450 foot wireless communication range and an adjustable volume control. The sensor works on curbside, wall mounted, and slot type mailboxes, making it ideal for almost any application. Just press the reset button after retrieving your mail to set the Mail Chime up for the next day’s delivery. Additionally, the Mail Chime can be used as a security device to notify you if someone is tampering with your mailbox. Includes a long lasting 12 volt battery.