Flashing color: This product features 7 flashing colors that can be adjusted according to personal preferences and specific occasions to enhance the decorative effect of the doorbell. Music selection: Built-in multiple music options allow users to customize their choice and create a warm family atmosphere. Wireless design: The doorbell adopts a wireless design, eliminating the need for complicated wiring. It is easy and quick to install with no tedious setup required. Suitable for the elderly and hearing-impaired: The doorbell offers loud volume and includes a light flashing function, enabling the elderly and hearing-impaired to notice visitors through both sound and visual cues. Practicality: In addition to functioning as a doorbell, this product can serve as a call button for young individuals or seniors with special needs to alert family members or caregivers. Power requirements: Operating voltage: DC 4.5V (3 batteries), operating current: less than 200mA. Encoding method: DIP switch. Music options: 28 tones. Volume: Adjustable across 8 levels from 0dB to 85dB. Receiving distance: Up to 100 meters. Dimensions: Button: 8 x 5 x 2.2 cm; Receiver: 10.2 x 6.7 x 3.0 cm.