This wireless doorbell offers convenient installation and reliable performance. Easy Installation: Self-powered transmitter requires no batteries; simply plug the receiver into an outlet and attach the button to your door using the included adhesive strips. Weatherproof Design: The doorbell button is IP44 waterproof, suitable for various weather conditions (-30 to 70°F). Extended Range: Enjoy a reliable wireless range of up to 400 feet. Customizable Settings: Choose from 38 melodies and adjust the volume (25-80dB). A flashing LED light is also included for those with hearing impairments. Smart Features: Self-learning code function allows you to easily pair the buttons with your preferred melody. The buttons can be set to different melodies to distinguish between front and back doors. Specifications: Volume Levels: 5 levels (including mute) Ringtone Options: 60 different ringtones Transmitter Size: 75 x 51 x 20 mm Receiver Size: 95 x 65 x 24 mm Operating Voltage: AC 110V-220V-240V Operating Frequency: 433MHz (adjustable) Note: While the button is IP44 waterproof, for extended lifespan in heavy rain, a separate waterproof cover is recommended (sold separately).