Aura Systems A1 Waterproof Wireless Doorbell, Over 50 Tones, 500 Foot Range, Black Attractive and Functional: Doorbell's modern and sleek design compliments the lightweight and compact frame, making it an ideal solution for any setting Easy to Control: Interface allows you to select from over 50 tones with 4 adjustable levels of volume, ranging from 25db to 110db Portable Design: Wireless doorbell has an operating range of 500 feet (1,000 feet in open areas), so you'll always hear visitors. Perfect for households, offices, businesses, or even store fronts Extremely Rugged: Transmitter's water resistant and weather proof design is IP33 rated, allowing for both indoor or year round outdoor use Simple Installation: Transmitter can be wall mounted through double sided adhesive tape or crew and anchor hardware (recommended)