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, creating a warm and welcoming atmosphere. Wireless design: The doorbell adopts a wireless design, eliminating the need for complicated wiring. It is easy and quick to install without any tedious setup. Suitable for elderly and hearing-impaired: The doorbell produces a loud sound and includes a visual flash indicator, allowing elderly individuals and those with hearing difficulties to easily notice visitors through both audio and visual signals. Practicality: In addition to functioning as a doorbell, this product can serve as a call button for young children or elderly individuals with special needs to alert family members or caregivers. Power requirements: Operates on DC4.5V (3 AAA batteries), with a working current of less than 200mA. Encoding method: Digital coding technology. Chimes: 28 selectable melodies. Volume: Adjustable across 8 levels, ranging from 0dB to 85dB. Transmission range: Over 100 meters in open area. Dimensions: Button: 8 x 5 x 2.2cm; Receiver: 10.2 x 6.7 x 3.0cm.