[Self-Powered Technology]Innovative push-button generator eliminates the need for batteries, ensuring long-term reliability and eco-friendly operation. [Extensive Range]Covers up to 150 meters in open areas, providing reliable connectivity throughout your property. [Customizable Melodies]Choose from 60 different tunes to personalize your doorbell experience beyond the typical "ding-dong" sound. [Adjustable Volume]Five-level volume control, including a silent mode with only LED flash notification for undisturbed environments. [Visual Alerts]LED indicator flashes when the doorbell is activated, ensuring you never miss a visitor, even in noisy settings. [Easy Installation]No wiring required for the transmitter, making it simple to set up and relocate as needed. Specifications: Material: ABS plastic Transmitter Dimensions: 80mm x 44mm x 21mm Receiver Dimensions: 100mm x 57mm x 25mm Power Source: Self-Powered (transmitter), AC 110 or 220V (receiver) Wireless Range: Up to 150 meters in open areas Volume Levels: 5 adjustable settings Melodies: 60 different tunes Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.