【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 110/220V (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.