Upgraded Mailbox Chime Alert: Our newly designed mailbox sensor allows you and your family to avoid frequent trips to check mail during cold winter nights, reducing inconvenience and saving time. The mailbox alert anti-theft feature helps protect your mail. Enhanced Coverage and Expandable Pairing: Mail alert receivers can operate up to 800 feet in an unobstructed area, ensuring you never miss a notification. It supports pairing with multiple transmitters, making it suitable for homes and offices with multiple mailboxes. Instant Alerts and LED, Music Notification: When the mailbox is opened, the receiver immediately emits a sound and activates a blue LED light that continues to flash until the stop button is pressed. Choose from three different alert tones to suit your preference for a personalized experience. Easy Installation: The mailbox alarm is battery-powered and wire-free for simple setup. It is compatible with various mailbox types, including standard, wall-mounted, and slot mailboxes, allowing easy adjustments based on your mailbox type. Color: White. Material: Plastic. Package Contents: 1 set x Mailbox Alarm. Only the above items are included; other products are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.